[Step-by-Step] A rectangular building is to have a volume of 8000 ft 3 . Annual heating and cooling costs will amount to $2/ft 2 for its top, front, and back,
Question: A rectangular building is to have a volume of 8000 ft 3 . Annual heating and cooling costs will amount to $2/ft 2 for its top, front, and back, and $4/ft 2 for the two end walls. What dimensions of the building would minimize these annual costs?
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