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|dw:1354762359854:dw|

That looks alright to me.

but the second derivative i have probs with. Like finding the dimensions

A'' = -216/y?

OOOOHHHH ok.... I tried to derive it while it's a fraction it obviously didn't work hahaha

Okkk, so that makes more sense that at A''(12) its positive, therefore its a min!

ok so when i find the dimensions, i would have to find x?