Need help with these please???

What is the inverse of the function f(x) = 2x + 1?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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