SAT Practice Test 5, Section 7: Questions 16 - 20

This is for SAT in Jan 2016 or before.

The following are worked solutions for the questions in the math sections of the SAT Practice Tests found in the The Official SAT Study Guide Second Edition.

It would be best that you go through the SAT practice test questions in the Study Guide first and then look at the worked solutions for the questions that you might need assistance in. Due to copyright issues, we are not able to reproduce the questions, but we hope that the worked solutions will be helpful.

16. Correct answer (B)

Given:
The figure
Diane travels from A to B,from B to C and from C to D

AB = 16
BC = 15
CD = 4

To find:
How much shorter is the trip if she travels directly from A to D

Solution:
Topic(s): Pythagoras theorem

The direct path from A to D is the hypotenuse of the right triangle ADE.

We can use Pythagoras theorem to get the length of AD.

Length of AE = 16 + 4 = 20

Answer (B) 25

17. Correct answer: (D)

Given:
One circle has a radius of
Another circle has a radius of 1

To find:
Ratio of the area of the larger circle to the area of the smaller circle

Solution:
Topic(s): Area of circle

Area of larger circle = π(1)² = π

Area of smaller circle =
Ratio of area of larger circle to the area of smaller circle =

Answer: (D) 4:1

18. Correct answer: (B)

Given:
The sum of consecutive integers from –22 to x, inclusive is 72

To find:
The value of x

Solution:
Topic(s): Consecutive integer problems

The consecutive integers for –22 to x inclusive are
-22, -21, -20, …, -1, 0, 1, …,22, 23,.., x

Sum of consecutive numbers from –22 to 22 is 0

We can then add from 23 until we get the sum of 72
23 + 24 + 25 = 72

Answer: (B) 25

19. Correct answer: (A)

Given:

k, n, x and y are positive numbers

To find:
The value of in terms of n and k

Solution:
Topic(s): Exponents

Answer: (A)

20. Correct answer: (E)

Given:
f(x) = x² – 4x
g(x) = f(x + h) + k

To find:
The value of hk

Solution:
This is a graph translation question.

From the graph, we see that the function g(x) is the function f(x) moved 3 units to the right and 2 units down.

Moving 3 units to the right means h = – 3 and moving 2 units down means k = – 2 i.e. g(x) = f(x – 3) – 2

So, hk = (-3)(-2) = 6

Answer: (E) 6

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