在备考
5月8日
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?
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<0, 则B
3. n is an integer.
Quantity A:(-1)^n*(-1)^(n+2)
Quantity B:1
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：C
解析：如果n是奇数，则负负得正等于1;如果n是偶数，依然是1
4. 1/2 < r <1
Quantity A:2r
Quantity B:1/r
A. QuantityA is greater.
B. QuantityB is greater.
C. The twoquantities are equal
D. Therelationship cannot be determined from the information given.
答案：D
解析：如果r为1，则A>B, 如果r为0.1， 则A