5. Use the roster method to write the set. the positive-integer multiples of 6 that are less than or equal to 48

12. Write the set of real numbers in interval notation.

{x | 6 < x < 4}

13. Write the set of real numbers in interval notation.

{x | 3 x 5}

14. Write the set of real numbers in interval notation.

{x | x < 9}

18. Find

A B.

(Use the roster method to write the set.)

A = {1, 4, 8}, B = {3, 4, 7}

19. Find

A B.

(Enter EMPTY or for the empty set. Use the roster method to write the set.)

A = {3, 13, 17}, B = {2, 3, 4}

20. Graph. (If there is no solution, enter NO SOLUTION.)

{x | x > 9} {x | x < 9}

21. Graph. (If there is no solution, enter NO SOLUTION.)

{x | x 2} {x | x > 10}

22. Graph. (If there is no solution, enter NO SOLUTION.)

[9, 0) (1, 4]