Using the horizontal-line test, determine whether the function is one-to-one.
A. one-to-one
B. not one-to-one
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 16,000, in how many years is the population expected to be 40,000? (Round to the nearest year.)
A. 10 yr B. 23 yr C. 128 yr D. 13 yr
Change the improper fraction to a whole or mixed number.
A. 19
B. 20
C. 18
D. 19
Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
dollars. The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $387.50?
A. {x ? 26 < x < 30} B. {x ? 27 < x < 29} C. {x ? 32 < x < 38} D. {x ? 25 < x < 31}
Find any x-intercepts.f(x) = 17x2 + 19x + 16
A. -16
B. 16
C. none
D. 
and 