I am not sure what these problems are requesting. I have watched Discrete Math videos and read my textbook, still unable to arrive at the answers.

List the (distinct) elements in each of the following set:

1e.) {aÎN | a < -4 and a > 4}

Let A = {(-1,2), (4,5), (0,0), (6,-5), (5,1), (4,3)}

List the elements in each of the following sets.

3b.) {a | a > 0 and (a,b) Î A for some b}

4.) List the elements in the sets A={a,b) Î N x N | a≤b, b≤3} and B={a/b Î {-1,1,2} }.