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A cube's edge grows at 3 cm/s. How fast does its volume grow when the edge is 2 cm?
A36 cu cm/s
B12 cu cm/s
C24 cu cm/s
D18 cu cm/s
Answer & Solution
Correct answer: A. 36 cu cm/s
dV/dt = 3x^2 dx/dt = 3 times 4 times 3 = 36.
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