38-m is less than or equal to 4(2-m)

Plz hurry evaluate the expression a+b where a=8 and b=19

Im so bad at fractions they are not my best math thing to work on

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.