The length of a rectangle is 8 feet more than its width. if the width is increased by 4 feet and the length is decreased by 5 feet, the area will remain the same. set up an equation to find the answer. give detail.

With #! i’ve tried to figure it out but i can’t.

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Apool measures 12.3 feet by 16.6 feet. if the longer wall of the pool has a diagonal of 17.8 feet, what is the volume of the pool? (round to nearest tenth)