If we blow air into a balloon of spheric...

If we blow air into a balloon of spherical shape at a rate of `1000 cm^(3)` per second. At what rate the radius of the balloon changes when the radius is 7cm? Also compute the rate at which the surface area changes .

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The correct Answer is:

`=8pixx7xx(250)/(49pi)=(2000)/(7)`

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