A rancher has a rectangular piece of sheet metal that is 20 inches wide by 10 feet long. He plans to fold the metal into a three-sided channel and wveld two other sheets of metal to the ends to form a watering trough 10 ft long. How should he fold the metal in order to maximize the volume of the resulting trough? What is the maximum volume? (HINT: express a in terms of x; note a is given in inches.) b=10H b=10円 120inch.

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