Solve and check.
= 
A. 2
B. - 
C. - 6
D. 6
Answer: C
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At one high school, the mean time for running the 100-yard dash is 
with a standard deviation of 0.9 seconds. The times are normally distributed.Find the percent of times that are below 17 seconds.
A. 84% B. 98% C. 2.5% D. 97.7%
Solve the problem.Find the sum of the first 11 terms of the arithmetic sequence 1, 3, 5, . . . .
A. 132 B. 100 C. 121 D. 144
Solve.The weekly sales in thousands of items of a product has a seasonal sales record approximated by 
(t = time in weeks with t=1 referring to the first week in the year). During which week(s) will the sales equal 70,950 items?
A. week 30 and week 47 B. week 21 and week 30 C. week 4 and week 47 D. week 4, week 20, and week 52
Solve the equation. Use the change of base formula to approximate an exact answer to the nearest hundredth when appropriate.2x = 128
A. x = log2128 B. x = 64 C. x = log 128 D. x = log 64