Solve the problem.A speedboat moves at a rate of 28 km/hr in still water. How long will it take someone to ride the boat 320 km downstream if the river's current moves at a rate of 4 km/hr?
A. 10,240 hr
B. 0.1 hr
C. 10 hr
D. 13 hr
Answer: C
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Solve the problem. Round your answer, if appropriate.The volume of a rectangular box with a square base remains constant at 900 cm3 as the area of the base increases at a rate of 13 
2/sec. Find the rate at which the height of the box is decreasing when each side of the base is 18 cm long. (Do not round your answer.)
A. 
cm/sec
B. 
cm/sec
C. 
cm/sec
D. 
cm/sec
Identify the base and the exponent for the exponential expression.(14x)10
A. Base: x, exponent: 10 B. Base: 10, exponent: 14x C. Base: 10, exponent: x D. Base: 14x, exponent: 10
Find the values of x such that the given function has the stated value.h(x) = -x2 + 9x + 20; h(x) = 40
A. {-5, -4} B. {5, 4} C. {5, -4} D. {-5, 4}
Find the inverse of the one-to-one function.f(x) = x - 2
A. f-1(x) = 
B. f-1(x) = -2x
C. f-1(x) = 2x
D. f-1(x) = x + 2