题目

1. Each week a salesperson receives a commission that is equal to 12 percent of the first $500 of sales plus 20 percent of additional sales. If the salesperson received a commission of$380 last week, what was the total amount of the sales that the salesperson made last week?

A. $1,600 B.$1,660

C. $1,860 D.$2,000

E. \$2,100

答案：E

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2. 已知x ≠ 0，

Quantity A: x^2

Quantity B: x(x+5)

A. Quantity A is greater.

B. Quantity B is greater.

C. The two quantities are equal

D. The relationship cannot be determined from the information given.

答案：D

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3. If x< y, which of the following must be true?

A. 2x< y

B. 2x> y

C. x2< y2

D. 2x-y< y

E. 2x-y< 2xy

答案：D