



 
Hi Meghan, You are to maximize the volume so you need an expression for the volume. The package is a "box" so the volume is given by V = l × x × y. You are correct in saying that l = 84  2x  2y so substitute into the expression for the volume giving you the volume as a function of x and y. Now try the partial derivatives. If you still have difficulties write back and tell us what you did. Harley  


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