What is is one plu one

How do i find the missing angle measure in a polygon

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

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.