For the function f, use composition of functions to show that f-1 is as given.
, 
What will be an ideal response?
Answers may vary. One possible solution is:
1. (f-1 ? f)(x) = f-1(f(x)) = f-1
= - 
= x;
2. (f ? f-1)(x) = f(f-1(x)) = f
= - 
= x
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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%
Simplify the algebraic expression by combining like terms.9y + 8 - 3y + 1
A. 15y B. 6y + 7 C. 6y + 9 D. 12y + 9
Evaluate the indicated trigonometric function of the acute angle ?.If ? is an acute angle of a right triangle and if tan ? = 
, then find the value of cos ?.
A. 
B. 
C. 2
D. 
Factor.5x2 - 35x + 60
A. 5(x - 3)(x - 4) B. 5x2 - 35x + 60 C. 5(x - 12)(x + 1) D. (x - 3)(5x - 20)