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is there an equation for the volume of a sphere?

no :(

haha i meant there's none that came with the problem! Not that none exist :)

the n is a pi

as long as you know what the power rule for derivatives is, that would help out alot

ok the radius is half the diameter right?

correct

i can find the derivative pretty easily but i'm just unsure what the radius would be

ok let me get you the derivative real quick

the derivative is 4pir^2 so that would be 4pi(7^2) and that would give me 615.44 about

very good, but there is one other part that needs to be addressed; the chain rule pops out an r'

ok... im lost

so that is 923.16 or so?

\[\frac d{dt}(V=\frac43\pi~r^3)\]
\[\frac {dV}{dt}=\frac43\pi~3r^2*\frac{dr}{dt}\]

4pi(7^2)*.3/2 = about 92.36

lol alright i calculated wrong and thanks a million!

with a little practice, these should make more sense :) good luck