The volume of air inside a rubber ball with radius r can be found using the function v(r)=4/3 πr3 . what does v[5/7] represent? a. the radius of the rubber ball when the volome equals 5/7 cubic feet b. the volome of the rubber ball when the radius equals 5/7 feet c. that the volume of the rubber ball is 5 cubic feet when the radius is 7 feet d. that the volume of the rubber ball is 7 cubic feet when the radius is 5 feet