Please explain, I dont understand how to do this

2.6.2 Reading and Understanding Code 4. What is the output of this code sequence? at double a -12.5; System.out.println( a); 5. What is the output of this code sequence? int a 6; System.out.println( a ); 6. What is the output of this code sequence? float a -13f; System.out.println( a ); 7. What is the output of this code sequence? double a 13/5; System.out.println( a ) 8. What is the output of this code sequence? int a 13/5; System.out.println( a ); What is the output of this code sequence? int a 13 % 5; System.out.println( a ); What is the output of this code sequence? int a 12 /6 2; System.out.println( a ); 9. 10. 11. What is the output of this code sequence? int a 12 (6 2): System.out.printIn( a) What is the output of this code sequence? int a 4+6/2 System.out.printin( a ) 12