If the diameter of a youth baseball is 2.8 inches and the diameter of an adult softball is 3.8 inches, what is the approximate difference in their volumes? Use 3.14 for pi. Round to the nearest tenth.

volume = 4/3 x 3.14 x r^3

4/3 * 3.14 = 4.18666

radius of youth ball = 2.8/2 = 1.4

volume = 4.18666 x 1.4^3 = 11.488 cubic inches

radius of adult ball = 3.8/2 = 1.9

voulume = 4.18666 x 1.9^3 = 28.716

28.72 - 11.49 = 17.2 cubic inches difference