How do you do these 2 questions?

Which of the following domains provide a real value periods

What is 0.368,0.380,0.365,and 0.383 in order from least to greatest

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.