Solve the problem.The polynomial function I(t) = -0.1t2 + 1.9t represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline? Round to the nearest tenth of a year, if necessary.
A. 12.7 years
B. 9.5 years
C. 19 years
D. 8.5 years
Answer: B
Mathematics
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