数学部分：
1. Each week a salesperson receives a commission that is equal to 12 percent of the first 500ofsalesplus20percentofadditionalsales.Ifthesalespersonreceivedacommissionof
380 last week, what was the total amount of the sales that the salesperson made last week?
6. $1,600
7. $1,660
8. $1,860
9. $2,000
10. $2,100
2. 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
解析：如果x>0, 则B>A; 如果x
