Solve. xy = 20x + y = 9
A. (-5, -4), (-4, -5)
B. (5, 4), (4, 5)
C. (-5, 4), (-4, 5)
D. (5, -4), (4, -5)
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
Identify the form of the argument and state whether the argument is valid or invalid.If you eat well, you will be well.If you are well, you will be happy.Therefore, if you eat well, you will be happy.
A. Fallacy of the inverse; invalid B. Law of contraposition; valid C. Law of syllogism; valid D. Fallacy of the converse; invalid
Solve the problem.
Use the graph of the polynomial function f to estimate the 
and to determine the minimum degree of f.
A. -4, 1, 2; 2 B. 4, 1, -2; 2 C. -4, 1, 2; 4 D. -4, -1, 2; 4
Given two similar triangles, as shown in the figure, find b?1.
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A. 
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B.
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C.
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D.
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E.
