I'm desperate. i need all of them answered

a. A' means the complement with respect to Z? If so, then

To know A' you need to write all the elements in Z that are not in A.

b. All the subsets of B, is knowed as P(B),

c. (Add to A the elements of B, or equivalently add to B the elements of A)

d.  express informally speaking the elements that have in common, but there is no element in common, so

if the angular bisector of an triangle bisects the opposite side, prove that the other two sides are equal.