Arturo O. answered • 05/28/20

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V(r) = (4/3)πr^{3}

**dV/dt = (dV/dr)(dr/dt) = 4πr**^{2}**dr/dt**

dr/dt = 9 cm/min

r = 8 cm

Plug these 2 numbers into the equation above for dV/dt and evaluate.