What has the sum of 20 but the difference is 8?

Which graph represents the solution of the inequality?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square