Need help please im on a quiz :)

What is the answer to |-2x-5|-|-4+8| and x=7

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180