Simplify the following expression.
13x+11y-3x+3y+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

Write an algebraic expression for the word expression the quotient of c and 8

Which of the following expressions is equal to 2x^2+8