. A rectangular pen is built with one side against a barn. If 2300 m of fencing are used for the other three sides of the​ pen, what dimensions maximize the area of the​ pen?   b. A rancher plans to make four identical and adjacent rectangular pens against a​ barn, each with an area of 400 m2 ​(see figure). What are the dimensions of each pen that minimize the amount of fence that must be​ used? Barn 400 400 400 400

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