A sports team is building a new stadium on a rectangular lot of land. If the lot measures 5x by 10x and the sports field will be 4x by 7x, how much of the lot will be left over to build bleachers on?

Answer 1

well, the area of the whole lot is 5 x * 10 x = 50 x^2
and the area of the playing field is 4 x * 7 x = 28 x^2
The difference is the space left for watching the game
50 - 28 = 22 x^2