The material for the bottom of a rectangular box costs three times as much per square foot

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The material for the bottom of a rectangular box costs three times as much per square foot as the material for the sides and top. Find the greatest volume that such a box can have if the total amount of money available for material is $12 and the material for the bottom costs $0.60 per square foot.
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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