What is 2/5 ÷ 2/3 i need help

Which term best describes the association between variables a and b

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

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents