If the measure of ACB is 50 degrees, what is the measure of that AOB

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 length and width of a 84.5 square foot rug? will mark

Having a hard time understanding this question (see attachment).