2. An open top rectangular tank with a square base is to have a volume of 10 cubic feet. The bottom is to cost 15 cents per square foot and the sides, 6 cents per square foot. Assuming 'y' as the height of the tank and 'x' as the length of an edge of the base, find the sum of 'x' and 'y' for the most economical dimensions.

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A:

Q: box

A: We will find out the height.