Which unit of measure is the most reasonable to use to estimate the weight of an elephant? select one: a. none of these b. pounds c. ounces d. tons

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.