Given matrix A, find the indicated cofactor.Find A13.A =
A. 21
B. 9
C. -6
D. -21
Answer: A
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This frequency table gives the distribution of ages of 100 people in a small town. 
How many people are:20 years of age or older but less than 60 years of age
A. 823 B. 67 C. 18 D. 69
At an annual inflation rate of 9.5%, how long will it take the Consumer Price Index (CPI) to double? Round your answer to two decimal places. ?
A. 7.64 year(s) B. 7.47 year(s) C. 7.38 year(s) D. 7.33 year(s)
Determine whether the given function is one-to-one. If it is one-to-one, find its inverse.f(x) = 2 - x
A. f-1(x) = x - 2
B. f-1(x) = 2 - x
C. f-1(x) = 
D. f-1(x) = x + 2
Solve the problem.The charges for renting a moving van are $65 for the first 30 miles and $7 for each additional mile. Assume that a fraction of a mile is rounded up. Find a symbolic representation for a function f that computes the cost of driving the van x miles, where 
(Hint: express f as a piecewise-constant function.) Then, determine the cost of driving the van 98 miles.
A. f(x) = 
; $6846
B. f(x) = 
; $541
C. f(x) = 
; $961
D. f(x) = 
; $961