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guest1234
(4(pir^3-600))/r^2=0 what is r?
\[\frac{ 4(\pi r^3-600) }{ r^2 }=0\]
(4(pir^3-600))/r^2=0 (pir^3-600)=0 r^3=600/pi r= cube root(600/pi) ans.. or r=(600/pi)^1/3 ans.. use your calculator to simplify them more
ok YW have fun now and good luck ... :D