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

Answer 1

Time to start showing some of your 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.

Answer 2

okai now I have the idea I will do myself from now on and for this
20cm^3/min=4π(2cm)^2dr/dt

Answer 3

just so