Question

a spherical ballon is inflated with gas at the rate 20cm^3 min. how fast is the radius of the ballon changing at the instant when the radius is 2cm
Time to start showing some of <u>your</u> work on these. They're all basically the same.

v = 4/3 πr^3
dv/dt = 4πr^2 dr/dt
...

We'll be happy to check your work on future problems.
okai now I have the idea I will do myself from now on and for this
20cm^3/min=4π(2cm)^2dr/dt
just so

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