Question 1122211
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The volume of a rectangular box is the length times the width times the depth.  Since you are cutting 4 cm squares from the corners, clearly the depth is 4 cm.  You are given that the length is the width plus 6 and the width is just the width.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ (w\ +\ 6)(w)(4)\ =\ 640]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ w^2\ +\ 6w\ -\ 160\ =\ 0]


Solve for *[tex \LARGE w] then calculate *[tex \LARGE w\ +\ 6]
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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