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We wish to build a rectangular pen. Three of the sides will be made from standard...

We wish to build a rectangular pen. Three of the sides will be made from standard fencing costing $7 per foot; the fourth side will be made using a decorative fence costing $19 per foot. If the total enclosed area must be 1200 sq. ft., what are the dimensions of the pen with the lowest total cost? What is that total cost?

short side:

long side:

total cost:

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