Find the dimensions of the open rectangular box of maximum volume that can be made from a sheet of cardboard

Question

Find the dimensions of the open rectangular box of maximum volume that can be made from a sheet of cardboard 11 in. by 7 in. by cutting congruent squares from the corners and folding up the sides. Then find the volume.

Answer 1

You need the measurment of the corner squares. Are they to be 1' incrimetes?

If I was to use inches the most room is 9*5*1=45 cu/in.