Just checking, is this correct?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

98 point question what is the record for most points in one

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box