(5x2 + 2x - 1) + (4x2-x-9)

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

Combine like terms to make a simpler expression 3z+z

Tell whether the two rates form a proportion