Solve the problem.Suppose that P(x) represents the percentage of income spent on housing in year x and I(x) represents income in year x. Determine a function H that represents total housing expenditures in year x.
A. H(x) = (P ? I)(x)
B. H(x) = 
(x)
C. H(x) = (P + I)(x)
D. H(x) = (I - P)(x)
Answer: A
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A. one-to-one B. not one-to-one
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? 
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