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I need help solving this equation. Can anyone help?

Find the least amount of material needed to make a square-based open box that has volume of 4000 cubic meters.

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    You have posted ten problems in the last few hours, all covering pretty much the same ground. STOP IT! Instead, read the answers to one question, think about them, try to understand them, see whether you can apply what you learn from one question to the solution of the others. Are you just harvesting answers, or are you actually trying to learn something?2012-06-11

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