Hello everyone

I'm struggling a little with this one, any help would be greatly appreciated, thank you.

Question:

A chemical manufacturer has commissioned a series of stainless steel open top rectangular boxes with square ends, what is the least area of stainless steel required to give a volume of 4m^3

a)Using differential calculus calculate the area of stainless steel required

b)Using the second derivative determine if this is a minimum volume

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