Help please !!

What is the measure of <8

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

What is the ratio fraction form of 25: 9

Solve the system of equations. 2x-2y=-4 and x+y=8. show work