12. [0/1 Points] DETAILS PREVIOUS ANSWERS DAVISPRESTAT1 1.4.034. MY NOTES ASK YOUR TEACHER Add or subtract the fractions as indicated and reduce to lowest terms. 3 20 5 X Submit Answer 13. [-/1 Points] DETAILS DAVISPRESTAT1 5.1.049. MY NOTES ASK YOUR TEACHER Let B = {0, 2, 4, 6, 8, 10} and C = (16, 17, 18, 19, 20}. Write C U B using the listing method. CUB = 14. [-/1 Points] DETAILS DAVISPRESTAT1 5.1.039. MY NOTES ASK YOUR TEACHER Let B = {2, 4, 6, 8, 10} and C = {12, 13, 14, 15, 16}. Write C n B using the listing method. (Enter EMPTY or 0 for the empty set.) CNB = 15. [-/1 Points] DETAILS DAVISPRESTAT1 1.4.050. MY NOTES ASK YOUR TEACHER Multiply the fractions and reduce to lowest terms. 6 11 10 16. [-/1 Points] DETAILS DAVISPRESTAT1 1.6.037. MY NOTES ASK YOUR TEACHER Write the number 3.78 x 10* in standard form