A stone dropped into a still pond sends out a circular
ripple whose radius increases at a constant rate of 2.9
ft/s.

(a) How rapidly is the area enclosed by the ripple increasing when the radius is 2 feet?

The area is increasing at

(b) How rapidly is the area enclosed by the ripple increasing at the end of 6.8 seconds?

The area is increasing at

You can earn partial credit on this problem.