A 12in.bv,r2r-Lin. sheet of cardboard is folded in half to form a 12in.by12in. rectangle as shown in the eccompa nying gure. Then four congruent squares of side length x are out from the comers of the folded rectangle. The sheet is unfolded, and the six tabs are folded up to form a ho): with sides and a lid. Complete pans (a) through (f) below. i i KHJL k m H 12mm a. 'Write a formula Vbc) for the volume of the box. V[)