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4 September, 06:47

A certain magical substance that is used to make solid magical spheres costs $400 per cubic foot. The power of a magical sphere depends on its surface area, and a magical sphere can be sold for $60 per square foot of surface area. If you are manufacturing such a sphere, what size should you make them to maximize your profit per sphere? Justify why it is a maximum rather than a minimum.

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  1. 4 September, 10:24
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    it could be A
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