Accounting—Tax Revenue: Suppose that the rural town of Rufusville decides to relax its zon...

Accounting—Tax Revenue: Suppose that the rural town of Rufusville decides to relax its zoning laws so that more land can be made eligible for commercial use. They estimate that the town’s annual tax revenue after the zoning changes can be modeled by

where x represents the number of years since the zoning laws were changed, and f(x) represents the annual tax revenue in thousands of dollars.

(a) Evaluate f(15) and interpret.

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(b) Determine f′( x).

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(c) Evaluate f′(15) and interpret.