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 above 15.2 seconds.
A. 68%
B. 34%
C. 50%
D. 48%
Answer: C
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Solve. Round to the nearest tenth if necessary.Before taking a typing course, Ian could type 28 words per minute. By the end of the course, he was able to type 82 words per minute. What was the percent increase?
A. 65.9% B. 192.9% C. 34.1% D. 74.5%
Factor.10xy + 30y
A. 10y(x + 30) B. 3y(x + 10) C. 10y(x + 3) D. 10y
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Doreen and Irena plan to leave their houses at the same time, roller blade towards each other, and meet for lunch after 2 hours on the road. Doreen can maintain a speed of 7.7 miles per hour, which is 70% of Irena's speed. If they meet exactly as planned, what is the distance between their houses?
A. 15.4 mi B. 26.18 mi C. 22 mi D. 37.4 mi
Round the decimal to the indicated place value.14.4073
hundredth
A. 14.4073 B. 14.31 C. 14.41 D. 14.51