Solve the problem. A reasonable quadratic model for the population of a certain city is found to be 
where P(t) is the population (in thousands) of the city in the year that is t years since 2012. A reasonable quadratic model for the consumption of bottled water in the city is 
, where B(t) is the total amount of bottled water (in thousands of gallons) consumed by the residents of the city in the year that is t years since 2012. Let M(t) be the annual mean consumption of bottled water per person in the year that is t years since 2012. If M(t) is obtained by
finding the ratio 
, what are the units of M?
A. people per gallon
B. gallons per thousand people
C. gallons per person
D. thousands of gallons per person
Answer: C
Mathematics
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Use a graphing calculator to help determine whether or not the given functions are inverses of each other.f(x) = 
; g(x) = 0.4x2 - 1.6, x ? 0
A. Yes B. No
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Write an equivalent expression. Use a commutative law.y + 3
A. y3 B. 3 + y C. 3(y + 1) D. 3y
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Decide whether or not the functions are inverses of each other.f(x) = (x - 6)2, x ? 6; g(x) = 
A. Yes B. No
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Find all specified roots.Fifth roots of i.
A. cis 
, cis 
, cis 
, cis 
, cis 
B. cis 
, i, cis 
, cis 
, cis 
C. cis 
, cis 
, cis 
, cis 
, 1
D. cis 
, cis 
, -1, cis 
, cis 
Mathematics