What are the dimensions of the rectangular field of maximum area that can be fenced with exactly 500 feet of fencing materials?

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter59: Areas Of Rectangles, Parallelograms, And Trapezoids
Section: Chapter Questions
Problem 79A
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What are the dimensions of the rectangular field of maximum area that can be fenced with exactly 500 feet of fencing materials?

 An oil tanker hits a reef and begins to leak oil. The resulting spill is circular in shape and increasing in  size. If the radius of the spill is increasing at the rate of 6 m/sec, how fast is the area of the spill increasing  when the radius is 100 meters?

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