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