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December 20, 2014

December 20, 2014

Posted by **Greg** on Thursday, October 18, 2012 at 9:19am.

Can someone just tell me what formula to use?

- Calculus -
**Reiny**, Thursday, October 18, 2012 at 9:38amDon't always look for a formula.

Define your variables and "create" your own formula

let the square base have sides x by x

let the height be h

Volume = x^2 h ----- (from V = length x width x height)

using the product rule:

d(Volume)/dt = x^2 dh/dt + h(2x) dx/dt

we are given all those values

dV/dt = 40^2 (2) + 100(80)(4)

= ....

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