# A/P Calculus

A Cyclist is riding on a path whose elevation is modeled by the function f(x) = 0.08(16x-x^2) where x and f(x) are measured in miles. Find the rate of change of elecation when x=4. Would this be 0.64?
dx/dt would be 1.28 - 0.16x and then plug in four?

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1. df/dx = .08(16-2x)
at x=4, df/dx = .08*8 = .64 as you figured.

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