Suppose that the surface area, S, and radius, r, of a sphere are changing with respect to time and satisfy the equation S = 47² -5 mm²/s, then find the following with the exact solution. Write Pi for the symbol . If ds dt a. b. dr dt dr dt when r = 4 mm when S= 64π mm² mm/s Remaining Time: 17:04:55 mm/s

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