A skydiver's parachute opened at 3000 feet. Thirty seconds later, the skydiver's height was recorded at 2500 feet. What is the rate of change and what does it mean in this situation?

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.