Can yall help me do this

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

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

One of the problems with our current election system is? ?