(4) A spherical balloon has radius r and surface area A = 47r2. If the balloon is deflating so that its radius decreases at a
(4) A spherical balloon has radius r and surface area A = 47r2. If the balloon is deflating so that its radius decreases at a constant rate of 2 inches per second, what is the relative rate of change of its surface area at the time when the radius is 10 inches
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