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Air is pumped into the balloon, so the volume after t seconds is given by V ( t ) = 1 5 + 1 8

Air is pumped into the balloon, so the volume after t seconds is given byV(t)=15+18t. . Find the composite function r(V(t)) and use it to answer the following questions. Round the results to the nearest hundredth of a second.

a. At what exact time is the radius 10 inches?

b. At what exact time is the radius 20 inches?

c. At what exact time is the radius 30 inches?

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