When a kitten is born it weighs 1.5 pounds. After 3 weeks it weighs 3 pounds. When the kitten is 6 weeks old it weighs 7.5 pounds. What percent weight gain did the kitten grow over from the first weight?

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.