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A shperical balloon is being inflated so...

A shperical balloon is being inflated so that its volume increases uniformly at the of `40 cm^(3)` / min. How fast is its surface area increasing, when the radius is 8 cm? Find approximately how much the radius is 8 cm ? Find approximately how much the radius will increase during the next `(1)/(2)` minute.

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The correct Answer is:
0.0248 cm (approx.)
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