A high school drama department sold 238 tickets for their performance. An adult ticket cost $6.75, A student ticket cost $3.50. The high school drama department collected $1,253.25 in ticket sales. How many student tickets were sold?

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.