Question: Use the differentiation feature on your graphing calculator to solve the problems (to 2 decimal places) below, where (x) is defined as follows: (x) =

Use the differentiation feature on your graphing calculator to solve the problems (to 2 decimal places) below, where ƒ(x) is defined as follows:

ƒ(x) = 1.25x3 + 0.01x2 - 2.9x + 1.
(a) Find ƒ′(4).
(b) Find all values of x where ƒ′(4) = 0.

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