Question 169451
(a)A U C is
{2,4,5,8,9}ie its the set of all elements that are in A and B
(b)Aintersection B becomes
{8,9} ie its the set of all alike elements in Aand B
(c)your question seems to be incomplete since there should be a set of elements  say A or B that you should complement with U.
Assuming the question was  A'(A complement)then we would have;
{1,3,5,6,7,10,11,12,13,14,15,16,17}ie all elements in U that aren't in A
(d)B U A U C
first find B U A which is {2,4,5,8,9}
then(B U A) U C which becomes {2,4,5,8,9,11,12,17}and hence the answer.