Can someone please help no random answer please or I will report this word problem uses the elimination method

What is the equation of the graph below? y=sec(x)-4

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 graph has a rate of change of zero