Simplify the expression. Assume all variables represent positive real numbers.
? 
A. -12
B. -20
C. 20
D. 12
Answer: D
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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 between 16.1 and 17 seconds.
A. 27% B. 13.6% C. 12% D. 34%
Solve the problem.The motion of a spring-mass system is described by the equation 
where y is the distance in feet from the equilibrium position and t is time in seconds. At which of the following times is the mass moving away from its equilibrium position: t = 1, t = 5/4, t = 7/4, t = 2 ?
A. t = 2
B. t = 1
C. t = 
D. t = 
Evaluate. Write the answer as a mixed number whenever possible.Two-thirds of 
A. 4
B. 5
C. 
D. 
Provide an appropriate response.If three distinct counting numbers have a sum of 9 and a product of 15, what is their median?
Fill in the blank(s) with the appropriate word(s).