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Is it a multiple choice question?

No

oh ok

tough question
have they given you an answer?

They have not no

make a cubic for it

first write the length width and height in terms of "w"

sorry i have to go. i can go through the full solution at another time. when would suit you?

I need it by tonight because it is due tomorrow and I will be busy

what time is it where you are?

Arizona time it's noon now

|dw:1434739818457:dw|

Take the derivative and find the x values where it is 0.

then test them with either the 1st or 2nd derivative test

make the derivative 0 and solve for x.
\[C'(x) = 60x-\frac{ 7 }{ x^2 }=0\]

here is the solution. peachpi's method is correct but the numbers are wrong.

yes that's right.

thanks

try $234.28