Posted by **Jessica** on Thursday, March 7, 2013 at 11:44am.

If the radius of a circular wave is increasing at 2 meters/sec, how fast is the area changing when the radius is 5 meters?

A)62.8 square meters per second

B)25.0 square meters per second

C)31.4 square meters per second

D)6.3 square meters per second

E) None of the above

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