What is 4 x 5 - (2sq - 2)

Asalesperson has january sales of $20,000(1,$20,000) and april sales of $80,000 (4,$80,000). what is the rate of change?

Me because i don't understand how to do it.: )

For a project you need to make three triangles out of cardboard.each triangle has a height of 5 inches and a base of 10 inches.which equation can use to solve for the total amount of cardboard you will need?