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September 17, 2014

September 17, 2014

Posted by **Anonymous** on Friday, March 25, 2011 at 7:06pm.

- calculus -
**Damon**, Friday, March 25, 2011 at 7:12pmwell, you forgot to say what that area was but anyway

for a sphere

V = (4/3) pi r^3

A = dV/dr = pi r^2

dV/dt = dV/dr * dr/dt = pi r^2 dr/dt

dV/dt = 10 given

so

10 = pi r^2 dr/dt

put in the r from the surface area you forgot to type and solve for dr/t

- calculus -
**Anonymous**, Friday, March 25, 2011 at 7:15pmOOps How fast is the radius of the balloon increasing when the surface area of the balloon is 2pi square inches?

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