Ten more than the quotient of a number and 3 is 12

seven more than twice a number is 1

the sum of 9 and the quotient of x and 7 is 11

the product of 8 and the difference of n and 3

translate verbal phrases

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.