Suppose a person wants to travel D miles at a constant speed of (2 + X) mi/hr, where x could be positive or negative. The time in minutes required to travel D miles is T(x) = 60D(2 + x)- 1. Show that the linear approximation to T at the point x = 0 is T(x) = L(x) = 15D(2 – x). ... 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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