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

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