Posted by **fareha** on Sunday, December 4, 2011 at 8:06pm.

1. A rectangle has a constant area of 200 square meters and its length L is increasing at the rate of 4 meters per second.

a. Find the width W at the instant the width is decreasing at the rate of .4 meters per second.

b. At what rate is the diagonal D of the rectangle changing at the instant when the width W is 10 meters?

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