A cube's edge grows at 2 cm/s. Its volume grows at what rate when the edge is 3 cm?
A18 cm^3/s
B36 cm^3/s
C54 cm^3/s
D27 cm^3/s
Answer & Solution
Correct answer: C. 54 cm^3/s
dV/dt = 3x^2 dx/dt = 3(9)(2) = 54 cubic cm per second.
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