A small aircraft starts its descent from an altitude of h = 4/5 miles, 4...

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A small aircraft starts its descent from an altitude of h = 4/5 miles, 4 miles west of the runway (see figure).(a) Find the cubic function f(x) = ax + bx + cx + d on the interval [-4, 0] that describes a smooth glide path for thelanding.(b) The function in part (a) models the glide path of the plane. When would the plane be descending the greatest rate?

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