Question 1125312
Hailstones A hailstone (a small sphere of ice) is forming in the clouds so that its radius is growing at the rate of 1 millimeter per minute. How fast is its volume growing at the moment when the radius is 2 millimeters? 
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{{{V = 4pi*r^3/3}}}
dV/dt = 4pi*r^2*dr/dt
dV/dt = 4pi*4*1 = 16pi cubic mms/minute
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Hint:  We don't need hints.