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1.) A rock is thrown into a still pond. The circular ripples move outward from the...


1.) A rock is thrown into a still pond. The circular ripples move outward from the point of impact of the rock so that the radius of the circle formed by a ripple increases at a rate of 5 ft./min.
Find the rate at which the area is changing at the instant the radius is 7 feet.

when the radius is 7 feet, the area is changing at approximately __ Square feet per minute

2.) The radius of a spherical balloon is increasing at a rate of 0.8 cm/min. how fast is the volume changing when the radius is 7.1 cm?

The volume is changing at a rate of ____ cm^3/min?
Math   Calculus   
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