Challenge A spherical balloon has a 16-in. diameter when it is fully inflated. Half of the air is let out of the balloon. Assume that the balloon remains a sphere. a. Find the volume of the fully-inflated balloon. b. Find the volume of the half-inflated balloon. c. What is the radius of the half-inflated balloon?

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A: Recall:Sphere, V=43πr3 We have r=6ft {since diameter=12ft=2*r}