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Stevex

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f" = 9x^2-6x-6 f"(-2) and f"(-1) and f"(2) are all positive, so f is concave up there. f"(0) is negative, so f is concave down there. wolframalpha is your friend. See the graph of f and f" there. Note how the concavity changes where f"=0.
If x is the smallest, then (x+2) + 2(x+1) = 27+2x
15*32/12 = ?
6 hours is twice as long as 3 hours, so twice as many pints will leak: 2*10 = 20 So now you have to ask, how many gallons is that? one gallon is 8 pints, so I think now you should have no trouble. . . . . . Right?

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