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You are designing a rectangular poster to contain 64 in2 of printing with a 4​-in margin...

You are designing a rectangular poster to contain 64 in2 of printing with a 4​-in margin at the top and bottom and a 1​-in margin at each side. What overall dimensions will minimize the amount of paper​ used? What is the vertical height of the poster that will minimize the amount of paper​ used?

what is the horizontal width that will minimize the amount of paper used ?

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