Find the critical points and the interval on which the given function is increasing or decreasing and apply the First Derivative Test to each critical point. Let f(x)=(5/4)x4+(25/3)x3+(-80/2)x2-(400)x There are three critical points. If we call them c1,c2, and c3, with c1

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A: As per the company's guidelines , we are supposed to answer only first question. Kindly re

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A: Please see the below picture for detailed solution.

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