Is -5.5 an integer? Please help ;)

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

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer