The radius r in inches of a spherical balloon after 1 seconds is given by r =

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The radius r in inches of a spherical balloon after 1 seconds is given by r = √t. 

(a) Is the radius increasing or decreasing? 

(b) Write a formula for a function V that calculates the volume of the sphere after 1 seconds. 

(c) Evaluate V(4) and interpret the result.

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