A child has a piece of flat cardboard with dimensions of 40 cm by 44 cm. She cuts out small congruent squares from each corner o
f the cardboard. She then folds up the sides of the cardboard creating a box with a height that is the same as the side length of the removed squares. The box does not have a top. The side length of each of the removed squares is 4x. Which of the following equations represents the volume of the box?
