HELP WITH MATH!!!

Perform the given set operation. Let 

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.

 (Enter your answers as a comma-separated list. Enter EMPTY for the empty set.)

{
x | 
x is a multiple of 2} 
 {
x is a multiple of 
9}