What is 13/21 in its simplest form?

Katlyn made 4 dresses with 7 yards of fabric. how many yards did she use on 1 dress?

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 point is the projection of q on a) r b) s c) t