A spherical balloon is inflated so that its volume is increasing at the rate of 20 cubic cm per second. What is the

Question

A spherical balloon is inflated so that its volume is increasing at the rate of 20 cubic cm per second. What is the instantaneous change in surface area, ds/dt, of the balloon increasing when the radius is 40 cm? [Use V=4/3 πr² and S = 4πr².]

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