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SAT Math : Algebra

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Example Questions

Example Question #3 : How To Evaluate A Fraction

Solve

Possible Answers:

no solution

infinitely many solutions

–1

Correct answer:

infinitely many solutions

Explanation:

The common denominator of the left side is x(x–1). Multiplying the top and bottom of 1/x by (x–1) yields

Since this statement is true, there are infinitely many solutions.

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Example Question #2 : How To Evaluate A Fraction

Evaluate when x=11. Round to the nearest tenth.

Possible Answers:

0.3

1.8

0.2

1.9

Correct answer:

1.8

Explanation:

Wherever there is an x, plug in 11 and perform the given operations. The numerator will be equal to 83 and the denominator will be equal to 46. 83 divided by 46 is equal to 1.804… and since the second decimal place is not greater than or equal to 5, the first decimal place stays the same when rounding so the final answer is 1.8.

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Example Question #3 : How To Evaluate A Fraction

For this question, the following trigonometric identities apply:

$\csc x=\frac{1}{\sin x}$ ,

$\sec x=\frac{1}{\cos x}$

$\cot x=\frac{1}{\tan x}$

Simplify: $\sin ^{2}x\csc x\cot x$

Possible Answers:

$\sin x$

$\sin x\cos x$

$\cos x$

$\sec x$

$\tan x$

Correct answer:

$\cos x$

Explanation:

To begin a problem like this, you must first convert everything to $\sin x$ and $\cos x$ alone. This way, you can begin to cancel and combine to its most simplified form.

Since $\csc x=\frac{1}{\sin x}$ and $\cot x=\frac{\cos x}{\sin x}$ , we insert those identities into the equation as follows.

$\sin ^{2}x\cdot \frac{1}{\sin x}\cdot \frac{\cos x}{\sin x}$

From here we combine the numerator and denominators of each fraction together to easily see what we can combine and cancel.

$\frac{\sin^{2}x\cdot \cos x}{\sin x\cdot \sin x}$

Since there is a $\sin ^{2}x$ in the numerator and the denominator, we can cancel them as they divide to equal 1. All we have left is $\cos x$ , the answer.

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Example Question #4 : How To Evaluate A Fraction

If 3x = 12, y/4 = 10, and 4z = 9, what is the value of (10xyz)/xy?

Possible Answers:

22 ¹/2

4 ¹/₂

360

160

Correct answer:

22 ¹/2

Explanation:

Solve for the variables, the plug into formula.

x = 12/3 = 4

y = 10 * 4 = 40

z= 9/4 = 2 ¹/₄

10xyz = 3600

Xy = 160

3600/160 = 22 ¹/2

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Example Question #5 : How To Evaluate A Fraction

If 5x=55 , x+y = 23 , and y-z=2 , find the value of $\frac{2x+y}{z}$ .

Possible Answers:

$\frac{13}{5}$

$\frac{9}{2}$

$\frac{17}{5}$

$\frac{16}{7}$

$\frac{19}{5}$

Correct answer:

$\frac{17}{5}$

Explanation:

In order to solve $\frac{2x+y}{z}$ , we must first find the values of , , and using the initial equations provided. Starting with 5x=55 :

$x=\frac{55}{5}=11$

Then:

x+y=23

11+y=23

y=12

Finally:

y-z=2

12-z=2

10=z

With the values of , , and in hand, we can solve the final equation:

$\frac{2x+y}{z}$

$=\frac{2(11)+12}{10}$

$=\frac{22+12}{10}$

$=\frac{34}{10}$

$=\frac{17}{5}$

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Example Question #6 : How To Evaluate A Fraction

If $x =\frac{1}{2}$ and $y=\frac{2}{3}$ , then which of the following is equal to $\frac{2}{x+y}$ ?

Possible Answers:

$\frac{9}{7}$

$2 \frac{1}{3}$

$\frac{12}{7}$

$\frac{10}{3}$

Correct answer:

$\frac{12}{7}$

Explanation:

In order to solve $\frac{2}{x+y}$ , first substitute the values of and provided in the problem:

$\frac{2}{\frac{1}{2}+\frac{2}{3}}$

Find the Least Common Multiple (LCM) of the fractional terms in the denominator and find the equivalent fractions with the same common denominator:

$\frac{2}{\frac{1}{2}+\frac{2}{3}}$

$=\frac{2}{\frac{3}{6}+\frac{4}{6}}$

$=\frac{2}{\frac{7}{6}}$

Finally, in order to divide by a fraction, we must multiply by the reciprocal of the fraction:

$=2\times \frac{6}{7}$

$=\frac{12}{7}$

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Example Question #2 : How To Evaluate A Fraction

Find the value of if $w=\bigg(\frac{1}{3}+y\bigg)^{2}$ and $y=\frac{1}{9}$ .

Possible Answers:

$\frac{4}{27}$

$\frac{3}{55}$

$\frac{9}{10}$

$\frac{1}{12}$

$\frac{16}{81}$

Correct answer:

$\frac{16}{81}$

Explanation:

In order to solve for , first substitute $y=\frac{1}{9}$ into the equation for :

$w=\bigg(\frac{1}{3}+y\bigg)^{2}$

$w=\bigg(\frac{1}{3}+\frac{1}{9}\bigg)^{2}$

Then, find the Least Common Multiple (LCM) of the two fractions and generate equivalent fractions with the same denominator:

$w=\bigg(\frac{3}{9}+\frac{1}{9}\bigg)^{2}$

Finally, simplify the equation:

$w=\bigg(\frac{4}{9}\bigg)^{2}$

$w=\frac{16}{81}$

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Example Question #21 : Algebraic Fractions

$\frac{7^{12}-7^{10}}{7^{11}-7^{9}}=$

Possible Answers:

343

Correct answer:

Explanation:

Factor out 7 from the numerator: $\frac{7(7^{11}-7^{9})}{7^{11}-7^{9}}$

This simplifies to 7.

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Example Question #251 : Algebra

If pizzas cost dollars and sodas cost dollars, what is the cost of pizzas and sodas in terms of and ?

Possible Answers:

15x+5y

15xy

$5x+\frac{3y}{15}$

3x+5y

$\frac{3x+5y}{15}$

Correct answer:

$\frac{3x+5y}{15}$

Explanation:

If 10 pizzas cost x dollars, then each pizza costs x/10. Similarly, each soda costs y/6. We can add the pizzas and sodas together by finding a common denominator:

$2*\frac{x}{10}+2*\frac{y}{6}=\frac{x}{5}+\frac{y}{3}=\frac{3x}{3*5}+\frac{5y}{5*3}=\frac{3x+5y}{15}$

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Example Question #252 : Algebra

Gre9

According the pie chart, the degree measure of the sector representing the number of workers spending 5 to 9 years in the same role is how much greater in the construction industry chart than in the financial industry chart?

Possible Answers:

$35^{\circ}$

$18^{\circ}$

$7^{\circ}$

$70^{\circ}$

$25^{\circ}$

Correct answer:

$25^{\circ}$

Explanation:

Since the values in the pie charts are currently in terms of percentages (/100), we must convert them to degrees (/360, since within a circle) to solve the question. The "5 to 9 years" portion for the financial and construction industries are 18 and 25 percent, respectively. As such, we can cross-multiply both:

18/100 = x/360

x = 65 degrees

25/100 = y/360

y = 90 degrees

Subtract: 90 – 65 = 25 degrees

Alternatively, we could first subtract the percentages (25 – 18 = 7), then convert the 7% to degree form via the same method of cross-multiplication.

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SAT Math : Algebra

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #3 : How To Evaluate A Fraction

Example Question #2 : How To Evaluate A Fraction

Example Question #3 : How To Evaluate A Fraction

Example Question #4 : How To Evaluate A Fraction

Example Question #5 : How To Evaluate A Fraction

Example Question #6 : How To Evaluate A Fraction

Example Question #2 : How To Evaluate A Fraction

Example Question #21 : Algebraic Fractions

Example Question #251 : Algebra

Example Question #252 : Algebra

All SAT Math Resources

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