Please help with 1 and 2

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

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

52 cm radius = diameter = area = circumference = circumfer