The vertical line test is a test used to determine whether a relation is also a function. It is done by inserting several vertical lines that intersect the relation. If a vertical line intersects the relation at multiple point, then it is not a function. If every single inserted vertical line intersects the relation at only one point, then the relation is a function.
R = radius of basketball r = radius of tennis ball R = 3.6r cube both sides the ratio of the radii is 1: 3.6 cube both sides to find the ratio of the volumes 1 : 46.656 ( this many times greater)
