Solve the problem.Refer to the figure, where f(t) is the interest rate (as a percent) on a 6-month certificate of deposit t years after January 1, 1985. The straight lines are tangent to the graph of  at   and  How fast was the interest rate changing on January 1, 1995?

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A. ? -2%/year
B. ? 1%/year
C. ? 2%/year
D. ? 0%/year


Answer: B

Mathematics

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