I need help with my math test

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

Consider the graph of the exponential function y=3(2)×

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b