# SAT MATH PREPARATION VIDEOS(Part - 2)

Problem 1 :

A certain business is marketing its product and has determined that, when it raised the selling price of its product, its sales went down. The number of units sold, P, is modeled by the equation P = 1200 - 20s, where s is the selling price, in dollars. Based on this model, what is the decrease in selling price from 700 units sold to 900 units sold?

A)  5

B)  10

C)  15

D)  20

Solution :

Problem 2 :

(x2 + y2)2 - (x2 - y2)2

Which of the following is equivalent to the expression above?

A)  x4 - y4

B)  2(x2 + y2)

A)  2x2y2

A)  4x2y2

Solution :

Problem 3 :

Kimberly earns k dollars per week. At this rate how many weeks will it take her to earn p dollars?

A)  p/k

B)  k/p

C)  kp

D)  10p/k

Solution :

Problem 4 :

If 2a/b = 5, what is the value of 5b/a?

A)  2

B)  4

C)  10

D)  12.5

Solution :

Problem 5 :

2x + by = 10

ax + 4y = 15

In the system of equations above, a and b are constants and a = 2b. If the system has no solution, which of the following could be a possible value of a?

A)  -2

B)  1/2

C)  4

D)  8

Solution :

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