Bluebook SAT Test Digital SAT Math Practice 2

Question 1

A car travels 240 miles in 4 hours at a constant speed. At this rate, how many miles will it travel in 7 hours?

Accepted Answer

420

Answer

The speed is 240/4 = 60 mph; in 7 hours it covers 60 × 7 = 420 miles.

Question 2

If the system of equations y = 2x + 1 and y = −x + 7 is graphed, at which point do the lines intersect?

Accepted Answer

(2, 5)

Answer

Setting 2x + 1 = −x + 7 gives 3x = 6, x = 2; substituting back yields y = 5.

Question 3

The population of a town doubles every 10 years. If the population is currently 5,000, what will it be in 20 years?

Accepted Answer

20,000

Answer

After 10 years the population is 10,000; after 20 years it doubles again to 20,000.

Question 4

A circle has a radius of 5. What is the area of the circle in terms of π?

Accepted Answer

25π

Answer

Area = πr² = π(5)² = 25π.

Question 5

If f(x) = 3x² + 2x − 1, what is the value of f(−1)?

Accepted Answer

0

Answer

f(−1) = 3(1) + 2(−1) − 1 = 3 − 2 − 1 = 0.

Bluebook SAT Practice Test