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Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 4 mi²/hr. How rapidly is the radius of the spill increasing when the area is 10 mi²?

 May 3, 2022
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Hints:

1) How can you relate the rate of change in area to the rate of change in radius?

2) What is the radius when the area is 10 mi^2? This is the value of the radius you need to substitute when you substitute area = 10 mi^2.

 May 3, 2022

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