r varies directly as s and inversely as t cubed. If r=607.5 when s=12 and t=2, find r when s=42 and t=6

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

George has seven boxes of five pencils. giulio three boxes of eight pencils. one of the boys arranges all his pencils equally into two groups. was this george or giulio how many are in each group explain

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.