If the diameter of a youth softball is 3.5 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 of a cubic inch. recall the formula sphere volume = four-thirds pi r cubed. 6.3 cubic inches 51.1 cubic inches 67.0 cubic inches 409.2 cubic inches