Rosita had 17 subtraction problems and 28 multiplication problems. if she ca finish five problems in 20 minutes, how long will it take her to finish all the problems?

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.