Posted by Cassy on Tuesday, March 9, 2010 at 12:31am.
The edge of a cube is increasing at a rate of 2 inches per minute. At the instant when the volume is 27 cubic inches, how fast is the volume changing? indicate the units of measure. V=x^3

Calculus  FredR, Tuesday, March 9, 2010 at 4:25am
dx/dt = 2 inches/min
V = x^3
so,
dV/dt = 2^3 = 8 cubic inches/min

Calculus  Reiny, Tuesday, March 9, 2010 at 7:43am
V = x^3
dV/dt = 3x^2 dx/dt
when V= 27, x = 3, dx/dt = 2
dV/dt = 3(3^2)(2) cubic inches/min
= 54 cubic inches/min
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