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September 20, 2014

September 20, 2014

Posted by **jennifer** on Wednesday, December 29, 2010 at 4:47am.

- AP calculus AB -
**Damon**, Wednesday, December 29, 2010 at 5:12amdV/dt = 9 = surface area * dh/dt

9 = (pi r^2)(dh/dt)

but

h = 3 r

so

dh/dt = 3 dr/dt

so

9 = (pi r^2)(2 dr/dt)

but r = 3

so

9 = 9 pi (2 dr/dt

dr/dt = 1/2pi

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