soty2013
The volume of a cube is increasing at a rate of 9 cubic centimetres per
second. How fast is the surface area increasing when the length of an edge is 10
centimetres ?
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soty2013
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@bob-bob-bob
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V (cube) = a^3
d v / dt = 3 a^2 d a/ dt
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9 = 3 a^2 d a /dt
3/ a^2 = d a/ dt
S = 6 a^2
d s/ dt = 6 * 2 a da / dt
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a = 10.... just sunstistute and find the answer
soty2013
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Thanks :) @Yahoo!
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Welcome..:)