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September 21, 2014

September 21, 2014

Posted by **maricela** on Wednesday, May 9, 2007 at 10:40pm.

There is not enough data given to set up the problem.

Wasn't the volume of the box given?

volume is 144cubic feet

volume is 144 cubic feet

ahh, now we got something to work with, hope it is not too late

let each side of the base be x, let the height be y

given: (x^2)y = 144 ----> y=144/x^2

Cost = 4(x^2) + 3(4xy)

=4x^2 + 12x(144/x^2)

= 4x^2 + 1728/x

Differentiate the Cost equation, set that result equal to zero and solve for x

(I got x=6)

thanx. i got 432 for the price and 4 for y

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