Related Rates: Balloon problem

Air is being pumped into a spherical balloon at a rate of 5 cm3/min. Determine the rate at which the radius of the balloon is increasing when the diameter of the balloon is 20 cm.
drag the diameter of the circle to see the change in the rate of the radius shown by the parabola.
The eqaution used for the rate of the radius in relation to the know volume is r'=(4*3.14*x^2)/5

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