This is just a tutorial on how to solve a problem like this.

The problem is:

So right off the bat I know the following.A Spherical balloon is to be deflated so that its radius decreases at a constant rate of 10 cm/min. At what rate must air be removed when the radius is 8 cm?

Air must be removed at ________ cm^3/min

It's only annoying because I can't find a video tutorial on it.

:Equation

I bring it into it's derivative form.

(just so you know the threes cancel)

Given:

(note: Any one reading this and wondering why it's negative ten is because it is deflating)

My attempt:

Just punch that into a caculator and you'll get the answer of:

This basically will work for any problem that's like this it's just a matter of changing the numbers.