Factor. Check by multiplying.18y3 - 4y2 + 8y
A. y(18y2 - 4y + 8)
B. 2y(9y2 - 2y + 4)
C. 2(9y3 - 2y2 + 4y)
D. 2y(9y3 - 2y2 + 4y)
Answer: B
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Solve.The population of a particular city is increasing at a rate proportional to its size. It follows the function P(t) = 1 + ke0.04t where k is a constant and t is the time in years. If the current population is 21,000, in how many years is the population expected to be 52,500? (Round to the nearest year.)
A. 134 yr B. 23 yr C. 13 yr D. 10 yr
A study of driving costs of 1992 model subcompact (four-cylinder) cars found that the average cost (car payments, gas, insurance, upkeep, and depreciation), measured in cents/mile, is approximated by the function
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where x denotes the number of miles (in thousands) the car is driven in a year. What happens to the average cost as the number of miles driven increases without bound?
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A. It approaches 2,640 ¢/mi. B. It approaches 19 ¢/mi. C. It increases without bound. D. It becomes infinitely small.
Using a parametric graph of the unit circle, find the function value.tan 
A. 0.4816 B. 0.9010 C. 2.0765 D. 0.4339
Simplify.
A. 4k B. 18 C. 4k2 D. 18k2