Tüm alıştırma soruları

2789 soru

Soru 2461Soru

While researching the Elfdalian language, a student takes the following notes:
* Elfdalian is a North Germanic language spoken in Älvdalen, Sweden, that evolved from Old Norse starting in the fourteenth century.
* Because of its geographical isolation, Elfdalian preserved many archaic grammatical features lost in modern Swedish.
* In a 2015 study, linguist Yair Sapir investigated Elfdalian's historical isolation and its retention of the runic alphabet.
* Sapir concluded that the language's geographical isolation served as a key preservation mechanism for these ancient linguistic traits.

The student wants to summarize the study and its findings. Which choice most effectively uses information from the given notes to accomplish this goal?

Cevabı ve açıklamayı göster

Cevap: Yair Sapir's 2015 study of Elfdalian concluded that the language's geographical isolation functioned as a preservation mechanism for ancient linguistic traits, such as archaic grammatical structures.

Cevap

Yair Sapir's 2015 study of Elfdalian concluded that the language's geographical isolation functioned as a preservation mechanism for ancient linguistic traits, such as archaic grammatical structures.
The correct option effectively summarizes Yair Sapir's 2015 study and its findings by stating that the study concluded that Elfdalian's geographical isolation served as a preservation mechanism for archaic features, such as its grammar and writing system.

Adım Adım Çözüm

1
Identify the student's rhetorical goal.
The goal is to summarize the study and its findings.
The prompt asks the student to choose the option that summarizes the study and findings, so the correct option must reference Sapir's study and its conclusion.
2
Evaluate the choices against the notes and the goal.
The option beginning with 'Yair Sapir's 2015 study' is the only choice that names the study and captures the main conclusion about geographical isolation acting as a preservation mechanism.
All other options either ignore the study entirely, misrepresent the factual details in the notes, or generalize beyond the evidence provided.

Anahtar Kavram

Rhetorical Synthesis: Summarization and Generalization
Soru 2462Soru

In the xyxy-plane, a square has vertices at (0,0)(0,0), (10,0)(10,0), (10,10)(10,10), and (0,10)(0,10). A line that passes through the points (0,2)(0,2) and (8,10)(8,10) divides the square into two regions. What is the area of the larger region?

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Cevap: 68

Cevap

The area of the larger region is 68.
The total area of the square is 102=10010^2 = 100. The line segment between (0,2)(0,2) on the left boundary and (8,10)(8,10) on the top boundary forms a right triangle with the top-left vertex of the square (0,10)(0,10). The legs of this right triangle have lengths 102=810 - 2 = 8 and 80=88 - 0 = 8, so its area is 12×8×8=32\frac{1}{2} \times 8 \times 8 = 32. The area of the other region is 10032=68100 - 32 = 68. The larger area is therefore 68.

Adım Adım Çözüm

1
Calculate the area of the square
100
The square has vertices at (0,0)(0,0), (10,0)(10,0), (10,10)(10,10), and (0,10)(0,10), which gives a side length of 10. The area of a square is side2\text{side}^2.
2
Determine the dimensions of the smaller triangular region formed by the line
Legs of length 8 and 8
The line intersects the left edge at (0,2)(0,2) and the top edge at (8,10)(8,10). The corner of the square is at (0,10)(0,10). The distance from (0,2)(0,2) to (0,10)(0,10) is 8, and the distance from (8,10)(8,10) to (0,10)(0,10) is 8.
3
Calculate the area of the smaller triangular region
32
The area of a right triangle is 12×base×height=12×8×8=32\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 8 \times 8 = 32.
4
Subtract the area of the smaller region from the total area of the square to find the area of the larger region
68
The area of the larger region is the total area of the square minus the area of the smaller region: 10032=68100 - 32 = 68.

Anahtar Kavram

Calculating the area of a region by partitioning a geometric shape or using subtraction of areas.
Soru 2463Soru

The graph of a third-degree polynomial function gg has xx-intercepts at (2,0)(-2, 0) and (3,0)(3, 0). At x=2x = -2, the graph is tangent to the xx-axis, and the graph passes through the point (1,12)(1, -12). What is the yy-intercept of the graph of gg?

Cevabı ve açıklamayı göster

Cevap: (0,8)(0, -8)

Cevap

The yy-intercept of the graph is (0,8)(0, -8).
The polynomial has a double root at x=2x = -2 because it is tangent to the xx-axis at (2,0)(-2, 0), and a single root at x=3x = 3 because it crosses the xx-axis at (3,0)(3, 0). This allows us to write the cubic polynomial as g(x)=a(x+2)2(x3)g(x) = a(x+2)^2(x-3). Substituting the point (1,12)(1, -12) gives 12=a(1+2)2(13)    12=18a    a=23-12 = a(1+2)^2(1-3) \implies -12 = -18a \implies a = \frac{2}{3}. To find the yy-intercept, we evaluate the function at x=0x = 0: g(0)=23(0+2)2(03)=23(4)(3)=8g(0) = \frac{2}{3}(0+2)^2(0-3) = \frac{2}{3}(4)(-3) = -8, which corresponds to the point (0,8)(0, -8).

Adım Adım Çözüm

1
Set up the general form of the cubic function using the given intercepts.
g(x)=a(x+2)2(x3)g(x) = a(x+2)^2(x-3)
An xx-intercept at (2,0)(-2, 0) where the graph is tangent to the xx-axis represents a root of multiplicity 2, which corresponds to the factor (x+2)2(x+2)^2. An xx-intercept at (3,0)(3, 0) represents a root of multiplicity 1, corresponding to the factor (x3)(x-3).
2
Use the point (1,12)(1, -12) to solve for the constant coefficient aa.
a=23a = \frac{2}{3}
Substitute x=1x = 1 and g(1)=12g(1) = -12 into the equation: 12=a(1+2)2(13)    12=a(9)(2)    12=18a    a=23-12 = a(1+2)^2(1-3) \implies -12 = a(9)(-2) \implies -12 = -18a \implies a = \frac{2}{3}.
3
Calculate the yy-intercept of the function by evaluating g(0)g(0).
g(0)=8g(0) = -8, which corresponds to the point (0,8)(0, -8)
The yy-intercept of a graph occurs where x=0x = 0. Substituting x=0x = 0 into the equation g(x)=23(x+2)2(x3)g(x) = \frac{2}{3}(x+2)^2(x-3) yields g(0)=23(0+2)2(03)=23(4)(3)=8g(0) = \frac{2}{3}(0+2)^2(0-3) = \frac{2}{3}(4)(-3) = -8.

Anahtar Kavram

Identifying polynomial factors and equations from graphical features like intercepts and tangency.
Soru 2464Soru

The graph of the quadratic function hh has a vertex at (2,5)(2, -5) in the xyxy-plane. If the function gg is defined by g(x)=h(x+3)+4g(x) = h(x + 3) + 4, what is the vertex of the graph of gg?

Cevabı ve açıklamayı göster

Cevap: (1,1)(-1, -1)

Cevap

The vertex of the graph of gg is (1,1)(-1, -1).
The vertex of the graph of hh is given as (2,5)(2, -5). The function g(x)=h(x+3)+4g(x) = h(x + 3) + 4 represents a transformation of the graph of hh. Specifically, h(x+3)h(x + 3) shifts the graph horizontally to the left by 33 units, and adding 44 shifts the graph vertically up by 44 units. Applying these shifts to the original vertex coordinates: the new xx-coordinate is 23=12 - 3 = -1, and the new yy-coordinate is 5+4=1-5 + 4 = -1. Therefore, the vertex of the graph of gg is (1,1)(-1, -1).

Adım Adım Çözüm

1
Identify the vertex of the original function hh.
The vertex of hh is (2,5)(2, -5).
The problem states that the graph of the quadratic function hh has a vertex at (2,5)(2, -5).
2
Determine the horizontal translation from the expression h(x+3)h(x + 3).
A horizontal shift of 33 units to the left.
Replacing xx with x+cx + c in a function f(x)f(x) shifts the graph left by cc units. Here, c=3c = 3, so we shift the vertex xx-coordinate left by 33: 23=12 - 3 = -1.
3
Determine the vertical translation from the addition of 44.
A vertical shift of 44 units up.
Adding a constant dd to a function shifts its graph vertically by dd units. Here, d=4d = 4, so we shift the vertex yy-coordinate up by 44: 5+4=1-5 + 4 = -1.
4
Combine the shifted coordinates to find the new vertex.
The new vertex is (1,1)(-1, -1).
Combining the translated xx-coordinate of 1-1 and yy-coordinate of 1-1 gives the vertex of the graph of gg.

Anahtar Kavram

Quadratic Function Transformations
Soru 2465Soru

During the late Renaissance in England, a playwright's professional success depended heavily on securing royal patronage. Because staging new productions in London's public theaters required expensive licensing fees and elaborate costumes, a theatre company without a wealthy ________ financial backing was unlikely to survive for more than a few seasons.

Which choice completes the text so that it conforms to the conventions of Standard English?

Cevabı ve açıklamayı göster

Cevap: patron's

Cevap

patron's
The singular possessive noun 'patron's' correctly establishes that the financial backing belongs to one wealthy patron, which is grammatically consistent with the singular article 'a' at the start of the phrase.

Adım Adım Çözüm

1
Identify the relationship between the blank and the noun phrase 'financial backing'.
The word in the blank must show possession over 'financial backing', requiring a possessive form.
The financial backing belongs to the patron, so a possessive noun is needed.
2
Determine whether the possessive noun should be singular or plural by looking at grammatical context clues.
The singular article 'a' at the beginning of the modifier ('a wealthy...') indicates that only a single patron is being referred to.
The noun must agree in number with its preceding modifiers.

Anahtar Kavram

Identifying the correct singular or plural possessive noun form based on sentence context.
Soru 2466Soru

In right triangle ABCABC, the measure of angle BB is 9090^\circ. If the length of side ABAB is 6 and the length of side ACAC is 10, what is the length of side BCBC?

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Cevap: 8

Cevap

The length of side BCBC is 8.
By applying the Pythagorean theorem to right triangle ABCABC, we have AB2+BC2=AC2AB^2 + BC^2 = AC^2. Substituting the given values gives 62+BC2=1026^2 + BC^2 = 10^2, or 36+BC2=10036 + BC^2 = 100. Subtracting 36 from both sides gives BC2=64BC^2 = 64, and taking the square root yields BC=8BC = 8.

Adım Adım Çözüm

1
Identify the hypotenuse and the given leg in the right triangle.
The hypotenuse is AC=10AC = 10 and the given leg is AB=6AB = 6.
The side opposite the 9090^\circ angle (angle BB) is always the hypotenuse.
2
Apply the Pythagorean theorem.
AB2+BC2=AC2AB^2 + BC^2 = AC^2, which becomes 62+BC2=1026^2 + BC^2 = 10^2.
The Pythagorean theorem states that the sum of the squares of the legs of a right triangle equals the square of the hypotenuse.
3
Solve for the unknown leg BCBC.
36+BC2=100    BC2=64    BC=836 + BC^2 = 100 \implies BC^2 = 64 \implies BC = 8.
Simplify the squares, subtract 36 from both sides, and find the principal square root of 64.

Anahtar Kavram

The Pythagorean Theorem
Soru 2467Soru

In the field of materials science, researchers have developed self-healing concrete containing bacterial spores that produce calcium carbonate to seal cracks when exposed to moisture. __________, scholars in building preservation have successfully utilized bacterial treatments to repair historical stone monuments suffering from environmental degradation.

Which transition word or phrase most logically completes the passage?

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Cevap: Likewise,

Cevap

Likewise,
The correct option is the transition that indicates a similarity between the two statements. The first sentence describes using bacteria to repair cracks in concrete, while the second sentence describes using bacteria to repair historical stone monuments. Since both sentences illustrate similar applications of a biotechnology across different fields, the transition 'Likewise' is the most logical choice.

Adım Adım Çözüm

1
Analyze the relationship between the two sentences.
The first sentence explains how materials scientists use bacterial spores to repair concrete cracks. The second sentence explains how building preservationists use bacterial treatments to repair stone monuments.
Understanding the logical connection is necessary to choose the correct transition.
2
Identify the type of connection.
Both sentences describe similar methods (using bacteria for structural repair) in different fields, indicating a relationship of similarity.
This narrows down the choice to transitions that indicate similarity or analogy.
3
Evaluate the choices to find the one that best expresses similarity without redundancy.
The transition 'Likewise' correctly expresses similarity. The transition 'Conversely' indicates contrast, 'As a result' indicates cause and effect, and 'In addition, also' is redundant.
Selecting the most logical and grammatically correct option.

Anahtar Kavram

Transitions: Addition and Similarity
Tahmini Süre:1m 0s
Soru 2468Soru

The number of active participants in an online educational forum has been growing exponentially since the forum was launched. At the launch of the forum (t=0t = 0), there were 5,0005,000 active participants. Two months after the launch (t=2t = 2), there were 7,2007,200 active participants. If the number of active participants continues to grow exponentially at this constant monthly percent rate, what is the number of active participants in the forum four months after the launch (t=4t = 4)?

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Cevap: 10368

Cevap

The correct number of active participants in the forum four months after the launch is 10,368.
To find the number of participants at t=4t = 4, we identify that the growth is exponential, meaning the population increases by a constant factor over equal time intervals. Since the population grew from 5,0005,000 to 7,2007,200 over a 2-month interval, the 2-month growth factor is 72005000=1.44\frac{7200}{5000} = 1.44. Because the interval from t=2t = 2 to t=4t = 4 is also exactly 2 months, the population will increase by the same factor of 1.441.44 again. Thus, the population at t=4t = 4 is 7200×1.44=103687200 \times 1.44 = 10368.

Adım Adım Çözüm

1
Set up the general exponential growth model equation.
P(t)=P0btP(t) = P_0 \cdot b^t, where P(t)P(t) is the number of participants at time tt months, P0P_0 is the initial number of participants, and bb is the monthly growth factor.
Establishing the model is necessary to use the given data to solve for unknowns.
2
Solve for the growth factor squared (b2b^2) using the given data points.
7200=5000b2    b2=72005000=1.447200 = 5000 \cdot b^2 \implies b^2 = \frac{7200}{5000} = 1.44. Taking the square root gives a monthly growth factor of b=1.2b = 1.2.
Determining the growth factor allows us to project the population for future times.
3
Calculate the active participant population at t=4t = 4 using the growth factor.
P(4)=P(2)b2=72001.44=10368P(4) = P(2) \cdot b^2 = 7200 \cdot 1.44 = 10368 (or P(4)=5000(1.2)4=10368P(4) = 5000 \cdot (1.2)^4 = 10368).
Finding the number of participants four months after launch answers the question.

Anahtar Kavram

Linear and Exponential Growth
Soru 2469Soru

A scientist measures the concentration of a chemical solution across five different trials. The concentrations recorded for the first four trials are 12.112.1 grams per liter (g/L\text{g/L}), 12.2 g/L12.2\text{ g/L}, 12.4 g/L12.4\text{ g/L}, and 12.5 g/L12.5\text{ g/L}. The concentration for the fifth trial is x g/Lx\text{ g/L}, where x<12.0x < 12.0. If the mean of the concentrations from all five trials is equal to their median, what is the value of xx?

Cevabı ve açıklamayı göster

Cevap: 11.8

Cevap

11.8
The correct answer is 11.811.8. Since x<12.0x < 12.0, sorting the five trial concentrations in ascending order gives xx, 12.112.1, 12.212.2, 12.412.4, and 12.512.5. The median is the middle value of this ordered list, which is 12.212.2. The mean is the sum of the five values divided by 55, which is x+12.1+12.2+12.4+12.55=x+49.25\frac{x + 12.1 + 12.2 + 12.4 + 12.5}{5} = \frac{x + 49.2}{5}. Setting the mean equal to the median gives the equation x+49.25=12.2\frac{x + 49.2}{5} = 12.2. Multiplying both sides by 55 yields x+49.2=61x + 49.2 = 61. Subtracting 49.249.2 from both sides gives x=11.8x = 11.8.

Adım Adım Çözüm

1
Order the data set in ascending order using the condition x<12.0x < 12.0.
x,12.1,12.2,12.4,12.5x, 12.1, 12.2, 12.4, 12.5
To find the median, the values must be listed in order. Since xx is less than 12.012.0, it must be the smallest value in the data set.
2
Identify the median of the five trials.
12.212.2
For a set of 55 ordered values, the median is the third value.
3
Write an equation representing the mean of the five trials set equal to the median.
x+12.1+12.2+12.4+12.55=12.2\frac{x + 12.1 + 12.2 + 12.4 + 12.5}{5} = 12.2
The problem states that the mean of the five concentrations is equal to their median.
4
Solve the equation for xx.
x=11.8x = 11.8
Multiply both sides of the equation by 55 to get x+49.2=61.0x + 49.2 = 61.0, then subtract 49.249.2 from both sides.

Anahtar Kavram

Calculating the mean and identifying the median of a data set, and solving for an unknown variable under inequality constraints.
Soru 2470Soru

Discovered in 1995 on the mouthparts of the Norway lobster (*Nephrops norvegicus*), the microscopic organism *Symbion pandora* belongs to the phylum Cycliophora. To anchor itself, the organism utilizes an adhesive disk located at its base, attaching to the lobster's sensory bristles, or setae. *Symbion pandora* does not prey on its host; instead, it consumes microscopic food debris generated when the lobster feeds. Intriguingly, its reproductive cycles are synchronized with the lobster's molting schedule. When the host sheds its exoskeleton, the organism initiates a sexual reproduction phase, producing free-swimming larvae that can quickly colonize the lobster's newly formed outer shell, thereby maintaining the association across generations.

Based on the text, what is true of *Symbion pandora*?

Cevabı ve açıklamayı göster

Cevap: It consumes microscopic food particles produced during the host's feeding process.

Cevap

It consumes microscopic food particles produced during the host's feeding process.
The correct answer is directly supported by the text, which states that the organism 'consumes microscopic food debris generated when the lobster feeds.' This matches the assertion that it consumes microscopic food particles produced during the host's feeding process.

Adım Adım Çözüm

1
Analyze the text for explicit details regarding the behavior, feeding, and life cycle of the organism.
The text states that the organism attaches to the lobster's setae using an adhesive disk, does not prey on the host, consumes microscopic food debris when the host feeds, and has reproductive cycles synchronized with the lobster's molting schedule.
To identify which option is directly supported by the factual claims in the passage.
2
Evaluate each option against the facts identified in the text.
The option stating that it consumes microscopic food particles produced during the host's feeding process is directly supported by the sentence stating it 'consumes microscopic food debris generated when the lobster feeds.' Other options contradict the text or introduce unsupported speculations.
To determine the single correct option that requires no extra inferences.

Anahtar Kavram

Identifying explicit details in a text without making speculative inferences.
Soru 2471Soru

The function ff is defined by f(x)=(x2)25f(x) = (x - 2)^2 - 5. The graph of the function gg in the xyxy-plane is obtained by translating the graph of ff by 33 units to the left and 44 units up. If the vertex of the graph of gg is (h,k)(h, k), what is the value of h+kh + k?

Cevabı ve açıklamayı göster

Cevap: -2

Cevap

-2
The correct answer is 2-2. The vertex form of a quadratic function is given by y=a(xh)2+ky = a(x - h)^2 + k, where (h,k)(h, k) is the vertex. For the function f(x)=(x2)25f(x) = (x - 2)^2 - 5, the vertex is at (2,5)(2, -5). Translating the graph of ff by 33 units to the left shifts the xx-coordinate of the vertex to 23=12 - 3 = -1. Translating the graph of ff by 44 units up shifts the yy-coordinate of the vertex to 5+4=1-5 + 4 = -1. Therefore, the vertex of the graph of gg is (h,k)=(1,1)(h, k) = (-1, -1), and the value of h+kh + k is 1+(1)=2-1 + (-1) = -2.

Adım Adım Çözüm

1
Identify the vertex of the original function f(x)=(x2)25f(x) = (x - 2)^2 - 5.
The vertex is (2,5)(2, -5).
For a quadratic function in vertex form y=a(xh)2+ky = a(x - h)^2 + k, the coordinates of the vertex are (h,k)(h, k).
2
Apply the horizontal translation of 33 units to the left to the vertex's xx-coordinate.
The new xx-coordinate is 23=12 - 3 = -1.
Shifting a graph horizontally to the left by cc units subtracts cc from the xx-coordinates of its points.
3
Apply the vertical translation of 44 units up to the vertex's yy-coordinate.
The new yy-coordinate is 5+4=1-5 + 4 = -1.
Shifting a graph vertically upward by cc units adds cc to the yy-coordinates of its points.
4
Calculate the sum of the coordinates of the new vertex (h,k)=(1,1)(h, k) = (-1, -1).
h+k=1+(1)=2h + k = -1 + (-1) = -2.
The question asks for the value of the sum h+kh + k, where (h,k)(h, k) is the vertex of the graph of gg.

Anahtar Kavram

Quadratic function vertex transformations
Soru 2472Soru

A right circular cylinder and a right circular cone have equal volumes. The radius of the cylinder's base is 33 times the radius of the cone's base. If the height of the cone is kk times the height of the cylinder, what is the value of kk?

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Cevap: 27

Cevap

27
The volume of a cylinder is Vcylinder=πrcylinder2hcylinderV_{\text{cylinder}} = \pi r_{\text{cylinder}}^2 h_{\text{cylinder}} and the volume of a cone is Vcone=13πrcone2hconeV_{\text{cone}} = \frac{1}{3} \pi r_{\text{cone}}^2 h_{\text{cone}}. Let the base radius of the cone be rr and the height of the cylinder be hh. According to the problem, the base radius of the cylinder is 3r3r and the height of the cone is khkh. Setting the volumes equal to each other gives π(3r)2h=13πr2(kh)\pi (3r)^2 h = \frac{1}{3} \pi r^2 (kh). Squaring the term in parentheses simplifies the equation to 9πr2h=k3πr2h9 \pi r^2 h = \frac{k}{3} \pi r^2 h. Dividing both sides by the common term πr2h\pi r^2 h yields 9=k39 = \frac{k}{3}. Multiplying both sides by 3 results in k=27k = 27.

Adım Adım Çözüm

1
State the standard volume formulas for a right circular cylinder and a right circular cone.
Vcylinder=πrcylinder2hcylinderV_{\text{cylinder}} = \pi r_{\text{cylinder}}^2 h_{\text{cylinder}} and Vcone=13πrcone2hconeV_{\text{cone}} = \frac{1}{3} \pi r_{\text{cone}}^2 h_{\text{cone}}
To establish the mathematical equations governing the volume of each solid.
2
Define variables for the cone's radius (rr) and the cylinder's height (hh), then write the cylinder's radius and the cone's height using the given relationships.
rcylinder=3rr_{\text{cylinder}} = 3r, rcone=rr_{\text{cone}} = r, hcylinder=hh_{\text{cylinder}} = h, and hcone=khh_{\text{cone}} = kh
To express all variables in terms of rr, hh, and the constant kk so they can be compared directly.
3
Substitute the expressions into the volume formulas and set the two volumes equal to each other.
π(3r)2h=13πr2(kh)\pi (3r)^2 h = \frac{1}{3} \pi r^2 (kh)
The problem states that the cylinder and the cone have equal volumes.
4
Simplify the equation by squaring the cylinder's radius and dividing both sides by the common factors.
9πr2h=k3πr2h    9=k3    k=279 \pi r^2 h = \frac{k}{3} \pi r^2 h \implies 9 = \frac{k}{3} \implies k = 27
To isolate and solve for the constant kk.

Anahtar Kavram

Relating the volumes of geometric solids through algebraic substitution and dimension scaling.
Soru 2473Soru

The graph of the polynomial function hh in the xyxy-plane has xx-intercepts only at (4,0)(-4, 0), (1,0)(1, 0), and (3,0)(3, 0). If the yy-intercept of the graph of hh is (0,12)(0, -12) and the degree of hh is 33, what is the value of h(2)h(2)?

Cevabı ve açıklamayı göster

Cevap: 6

Cevap

6
Since the degree of the polynomial function hh is 3 and its only xx-intercepts are (4,0)(-4, 0), (1,0)(1, 0), and (3,0)(3, 0), the function can be expressed in factored form as h(x)=a(x+4)(x1)(x3)h(x) = a(x + 4)(x - 1)(x - 3), where aa is a constant. We can find the value of aa by using the yy-intercept of (0,12)(0, -12). Substituting x=0x = 0 into the equation gives 12=a(0+4)(01)(03)-12 = a(0 + 4)(0 - 1)(0 - 3), which simplifies to 12=12a-12 = 12a, so a=1a = -1. The complete function is therefore h(x)=(x+4)(x1)(x3)h(x) = -(x + 4)(x - 1)(x - 3). To find h(2)h(2), substitute 22 for xx: h(2)=(2+4)(21)(23)=(6)(1)(1)=6h(2) = -(2 + 4)(2 - 1)(2 - 3) = -(6)(1)(-1) = 6. This matches the correct answer.

Adım Adım Çözüm

1
Write the general form of the cubic polynomial function h(x)h(x) using its xx-intercepts.
h(x)=a(x+4)(x1)(x3)h(x) = a(x + 4)(x - 1)(x - 3)
Since the degree of hh is 3 and its only xx-intercepts are (4,0)(-4, 0), (1,0)(1, 0), and (3,0)(3, 0), the corresponding factors must be (x(4))=(x+4)(x - (-4)) = (x + 4), (x1)(x - 1), and (x3)(x - 3), multiplied by a constant leading coefficient aa.
2
Use the yy-intercept (0,12)(0, -12) to solve for the constant coefficient aa.
a=1a = -1
Substituting x=0x = 0 and h(0)=12h(0) = -12 into the equation gives 12=a(0+4)(01)(03)-12 = a(0 + 4)(0 - 1)(0 - 3), which simplifies to 12=12a-12 = 12a. Solving for aa gives a=1a = -1.
3
Evaluate h(2)h(2) using the fully defined function h(x)=(x+4)(x1)(x3)h(x) = -(x + 4)(x - 1)(x - 3).
h(2)=6h(2) = 6
Substitute x=2x = 2 into the polynomial: h(2)=(2+4)(21)(23)=(6)(1)(1)=6h(2) = -(2 + 4)(2 - 1)(2 - 3) = -(6)(1)(-1) = 6.

Anahtar Kavram

Polynomial Factors and Graphs
Tahmini Süre:1m 30s
Soru 2474Soru

Great Zimbabwe, a medieval city in the southeastern hills of Zimbabwe, is renowned for its monumental stone walls. Constructed between the 11th and 15th centuries by the ancestral Shona people, these walls are unique because they were built entirely using dry-stone masonry, meaning no mortar was used to bind the granite blocks together. The largest structure, the Great Enclosure, has walls reaching heights of over 30 feet. While early European investigators incorrectly hypothesized that the city was built by foreign civilizations, modern archaeological evidence confirms that the local Shona population designed and constructed the complex. The walls likely served as a symbol of royal authority and prestige rather than primary defensive fortifications, given their layout and lack of defensive features.

According to the text, which statement is true about the construction of the walls at Great Zimbabwe?

Cevabı ve açıklamayı göster

Cevap: They were built without the use of mortar to hold the stone blocks together.

Cevap

The walls of Great Zimbabwe were built without the use of mortar to hold the stone blocks together.
The correct answer is supported by the text's explicit statement that the walls of Great Zimbabwe are unique because they were built entirely using dry-stone masonry, meaning no mortar was used to bind the granite blocks together.

Adım Adım Çözüm

1
Identify the key details in the passage regarding the construction methods of the walls of Great Zimbabwe.
The passage states that the walls 'were built entirely using dry-stone masonry, meaning no mortar was used to bind the granite blocks together.'
This direct statement provides the explicit fact required to answer the question.
2
Evaluate the choices against the identified explicit details from the text.
The statement about the walls being built without mortar matches the text directly, whereas other choices contradict the text or introduce unsupported speculations.
This confirms the correct option based strictly on the text's explicit information.

Anahtar Kavram

Identifying explicit details in an informational text
Soru 2475Soru

A landscape architect is designing two similar gardens. The smaller garden is in the shape of a regular hexagon and has an area of 24324\sqrt{3} square meters. The larger garden is also a regular hexagon, and its perimeter is 33 times the perimeter of the smaller garden. An inscribed circular fountain is to be placed in the center of the larger garden, touching all six sides. What is the area, in square meters, of the circular fountain?

Cevabı ve açıklamayı göster

Cevap: 108π108\pi

Cevap

The area of the circular fountain is 108π108\pi square meters.
The side length of the smaller hexagon is calculated to be 44 meters using the area formula for a regular hexagon. Because the larger hexagon's perimeter is scaled by a factor of 33, its side length is 1212 meters. The radius of the inscribed circle is the apothem of the larger hexagon, which is 12×32=6312 \times \frac{\sqrt{3}}{2} = 6\sqrt{3} meters. Squaring this radius and multiplying by π\pi results in an area of 108π108\pi square meters.

Adım Adım Çözüm

1
Find the side length of the smaller regular hexagon.
The side length is 44 meters.
The area of a regular hexagon with side length s1s_1 is given by A=332s12A = \frac{3\sqrt{3}}{2} s_1^2. Setting this equal to 24324\sqrt{3} yields s12=16s_1^2 = 16, so s1=4s_1 = 4.
2
Determine the side length of the larger regular hexagon.
The side length is 1212 meters.
Since the two hexagons are similar, the ratio of their perimeters is equal to the linear scale factor of their sides. The perimeter of the larger hexagon is 33 times that of the smaller hexagon, so its side length is s2=3×4=12s_2 = 3 \times 4 = 12.
3
Find the radius of the inscribed circle in the larger hexagon.
The radius is 636\sqrt{3} meters.
The radius rr of the inscribed circle is the apothem of the regular hexagon. For a hexagon with side length s2=12s_2 = 12, the apothem is r=s232=1232=63r = s_2 \frac{\sqrt{3}}{2} = 12 \frac{\sqrt{3}}{2} = 6\sqrt{3}.
4
Calculate the area of the inscribed circular fountain.
The area is 108π108\pi square meters.
Using the area formula for a circle, A=πr2A = \pi r^2, we substitute r=63r = 6\sqrt{3} to get A=π(63)2=108πA = \pi (6\sqrt{3})^2 = 108\pi.

Anahtar Kavram

Area of regular polygons, similarity ratio scaling, and properties of inscribed circles.
Soru 2476Soru

Mangrove forests serve as critical coastal buffers, mitigating the impact of severe storms by absorbing wave energy. Specifically, the complex, interlaced prop roots of the red mangrove (*Rhizophora mangle*) create a dense physical barrier that disrupts the momentum of incoming tides. While some researchers argue that the level of protection varies significantly depending on coastal topography, others emphasize the uniform benefits these ecosystems provide in high-risk zones. Ultimately, understanding these local variations is essential for designing effective coastal conservation strategies.

Which choice best describes the function of the underlined sentence in the text as a whole?

Cevabı ve açıklamayı göster

Cevap: It details a specific physical mechanism that illustrates the general claim made in the first sentence.

Cevap

It details a specific physical mechanism that illustrates the general claim made in the first sentence.
The correct option is correct because the first sentence of the passage makes a broad assertion about mangrove forests acting as storm buffers, and the underlined sentence immediately follows to explain the precise physical mechanism—the dense barrier created by the interlaced prop roots of the red mangrove—that allows them to do so. Thus, it functions as a specific illustration of the general opening claim.

Adım Adım Çözüm

1
Analyze the role of the first sentence in the passage.
The first sentence makes a general claim: mangrove forests mitigate storm impact by absorbing wave energy.
Understanding the context of the opening statement allows us to see how subsequent details relate to it.
2
Analyze the underlined sentence to identify its specific contribution to the passage.
The underlined sentence focuses on one specific type of mangrove (red mangrove) and explains the physical mechanism (interlaced prop roots creating a barrier to disrupt tides) by which it functions.
This establishes that the underlined sentence serves as a concrete illustration or explanation of the general claim in the first sentence.
3
Evaluate the remaining sentences to ensure the underlined sentence does not serve a different function relative to the whole.
The third sentence introduces a debate, and the final sentence states a conclusion about conservation. The underlined sentence provides the foundational factual detail supporting the opening claim before these other points are introduced.
This confirms that the function is supporting/illustrating the opening claim, not summarizing the whole debate or conclusion.

Anahtar Kavram

Part-to-Whole Rhetorical Function
Soru 2477Soru

A student is taking notes on epigraphy for a research project:

* Epigraphy is the scientific study of ancient inscriptions (epigraphs) engraved on durable materials.
* These materials include stone, clay, and metal.
* It is a primary branch of archaeology and historical linguistics.
* Deciphering these inscriptions helps researchers reconstruct historical events and cultural practices.
* The term "epigraphy" originates from the Greek words *epi* (meaning "upon") and *graphein* (meaning "to write").

The student wants to introduce the field of epigraphy to an audience unfamiliar with the term. Which choice most effectively uses information from the notes to accomplish this goal?

Cevabı ve açıklamayı göster

Cevap: Epigraphy, a branch of archaeology and historical linguistics, is the scientific study of ancient inscriptions engraved on durable materials such as stone, clay, or metal.

Cevap

Epigraphy, a branch of archaeology and historical linguistics, is the scientific study of ancient inscriptions engraved on durable materials such as stone, clay, or metal.
The correct choice introduces the field by defining it ('the scientific study of ancient inscriptions engraved on durable materials') and providing context for its academic placement ('a branch of archaeology and historical linguistics'). This successfully introduces the concept to someone who has never heard of it before.

Adım Adım Çözüm

1
Identify the specific writing goal in the prompt.
The goal is to introduce and define the field of epigraphy to an audience unfamiliar with the term.
Understanding the goal helps filter out choices that focus on peripheral details or assume prior knowledge.
2
Analyze the notes to find the core definition and classification of the subject.
Epigraphy is defined as the scientific study of ancient inscriptions on durable materials (stone, clay, metal) and classified as a branch of archaeology and historical linguistics.
A proper introduction and definition must combine these core elements to be clear to an unfamiliar audience.
3
Evaluate the choices against the identified goal and key details.
The choice defining epigraphy as the scientific study of ancient inscriptions on durable materials and classifying it as a branch of archaeology and linguistics is correct, while other choices either neglect the definition or focus too heavily on secondary details.
This ensures the selected choice is the most effective synthesis for the target audience.

Anahtar Kavram

Rhetorical Synthesis: Introduction and Definition
Soru 2478Soru

In restoration ecology, the introduction of non-native plant species is sometimes proposed as a rapid method to stabilize soil and prevent erosion in degraded landscapes. While this approach can yield immediate benefits, many researchers caution that it can also ______ unforeseen ecological disruptions. For instance, these introduced species may outcompete native flora for resources, ultimately destabilizing local food webs and reducing biodiversity.

Which choice completes the text with the most logical and precise word or phrase?

Cevabı ve açıklamayı göster

Cevap: precipitate

Cevap

precipitate
The correct option is the word that means to cause an event or situation to happen suddenly or unexpectedly. The passage discusses how introducing non-native plant species can trigger ecological disruptions. Therefore, the word meaning to cause or trigger these disruptions is correct.

Adım Adım Çözüm

1
Analyze the context of the sentence containing the blank.
The sentence indicates that while there are immediate benefits, researchers warn the practice can lead to 'unforeseen ecological disruptions' that destabilize food webs.
Understanding the surrounding context helps identify the semantic direction and tone of the missing word.
2
Determine the required meaning of the blank.
The blank requires a verb that means to bring about or trigger these sudden negative disruptions.
Establishing the precise definition needed allows for a direct comparison with the answer choices.
3
Evaluate the choices to find the word that means to cause or trigger.
The word 'precipitate' means to cause a sudden, unexpected event (often negative), which fits the context perfectly.
This identifies the only word that is both semantically and grammatically correct.

Anahtar Kavram

Words in Context: High-Utility Vocabulary
Tahmini Süre:1m 30s
Soru 2479Soru

The polynomial function pp is defined by p(x)=x43x3+ax27x+10p(x) = x^4 - 3x^3 + ax^2 - 7x + 10, where aa is a constant. If x2x - 2 is a factor of p(x)p(x), what is the value of aa?

Cevabı ve açıklamayı göster

Cevap: 3

Cevap

3
According to the Factor Theorem, if x2x - 2 is a factor of the polynomial function p(x)p(x), then evaluating the polynomial at x=2x = 2 must yield a value of 00. Substituting x=2x = 2 into the equation gives p(2)=243(2)3+a(2)27(2)+10=0p(2) = 2^4 - 3(2)^3 + a(2)^2 - 7(2) + 10 = 0. Simplifying the terms results in 1624+4a14+10=016 - 24 + 4a - 14 + 10 = 0, which further simplifies to 4a12=04a - 12 = 0. Adding 1212 to both sides and dividing by 44 yields a=3a = 3.

Adım Adım Çözüm

1
Apply the Factor Theorem to set up the equation.
p(2)=0p(2) = 0
By the Factor Theorem, xcx - c is a factor of p(x)p(x) if and only if p(c)=0p(c) = 0.
2
Substitute x=2x = 2 into the polynomial expression.
243(2)3+a(2)27(2)+10=02^4 - 3(2)^3 + a(2)^2 - 7(2) + 10 = 0
Evaluating p(2)p(2) yields a linear equation in terms of the unknown constant aa.
3
Simplify the arithmetic terms in the equation.
4a12=04a - 12 = 0
Simplifying the constant values: 162414+10=1216 - 24 - 14 + 10 = -12.
4
Solve the linear equation for aa.
a=3a = 3
Isolating the variable term gives 4a=124a = 12, and dividing by 44 yields a=3a = 3.

Anahtar Kavram

The Factor Theorem states that a polynomial p(x)p(x) has a factor xcx - c if and only if p(c)=0p(c) = 0.
Soru 2480Soru

To show that the work belongs to the single artist mentioned in the passage, which form of the noun 'artist' should be used? Complete the passage by typing the correct form of the noun in the blank.

Aşağıdaki boşlukları doldurun

Japanese American artist Ruth Asawa is best known for her intricate, looped-wire sculptures. The work explores the relationship between light, shadow, and three-dimensional space.
Cevabı ve açıklamayı göster

Cevap

artist's
The singular possessive noun 'artist's' is correct because the context refers to a single artist (Ruth Asawa) and shows possession of the noun 'work'.

Adım Adım Çözüm

1
Identify the noun being modified and determine if possession is required.
The blank modifies 'work', showing ownership of the work. Therefore, a possessive form is required.
Possessive forms are used to show ownership or association with another noun.
2
Determine if the noun should be singular or plural based on context clues.
The passage introduces a single subject, 'Japanese American artist Ruth Asawa', and refers to 'her' sculptures, which establishes that only one artist is being discussed. The singular possessive form is needed.
This helps select the singular possessive form rather than the plural possessive form.

Anahtar Kavram

Singular Possessive Nouns
ÖncekiSayfa 124 / 140Sonraki
Tüm alıştırma soruları — SAT | Examkin