Thanks for the reply!
Okay, why do you assume that y+4x = 165? Is it because that's the highest value possible?
In any case, if I do that:
y+4x = 165
y = 165-4x
v = (x^2)(165-4x)
v = 165x^2 - 4x^3
v' = -12x^2 + 165x
Did I do this right? If so, should I just find the maximum of v' and that...
Homework Statement
UPS will only accept packages with a length of no more than 108 inches and length plus girth of no more than 165 inches. Assumign that the front face of the package is square, what is the largest volume package that UPS will accept?
Assuming the package looks like this...