4.95 + 0.07 x models are household monthly long-distance charges where x represents the number of minutes of long-distance calls during the month what are the monthly charges for each number of long-distance minutes

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.