What is the quotient of 21/4 and 5/8?

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

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 is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4