



 
Hi Chris, I got 11.41 m^{2}. I let the dimensions of the box be x m by x m by y m so x^{2} y = 3.5 m^{3} and thus y = 3.5/x^{2} m. The surface area is then
This gives
which I set equal to zero and found x to be the cube root of 10.5/4. Is this what you did? Harley Chris, Stephen wrote to me.
Do you see what he did? It depends on the dimensions of the lid. Is the lid x by y? That's what I thought. Is it x by x? That's Stepnens solution. Harley  


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