1. A child lets go of a helium-filled balloon from a height of 4 feet above ground. The value of r(t) is the rate of change, in feet per second, of the balloon's height after t seconds have elapsed. Write an expression, involving an integral, that gives the balloon's height after 5 seconds. Briefly explain your answer.

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A: hintddxtan-1x=11+x2 or,∫11+x2dx=tan-1x

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A: integration

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A: Let's find.

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A: Proceed as shown below...

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A:

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A: We need to find rate.

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