Suppose a person wants to travel D miles at a constant speed of (3 + x) mi/hr, where x could be positive or negative. The time in minutes required to travel D miles is T(x) = 60D(3 + x)-1. Show that the linear approximation to T at the point x = 0 is T(x) L(x) = 20D 1 3 Recall that the linear approximation L(x) is equal to T(a) + T'(a)(x- a). Find T'(x). T'(x) =

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