Solve the problem.A person invested $13,000, part of the money, x, was placed in a stock that paid 9% annual interest. The rest of the money suffered a 5% loss. Express the total annual income from both investments, I, as a function of x.
A. I(x) = 0.09x - 0.05(13,000 - x)
B. I(x) = 0.09x + 0.05(13,000 - x)
C. I(x) = 0.05x - 0.09(13,000 - x)
D. I(x) = -0.09x + 0.05(13,000 - x)
Answer: A
Mathematics
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