Youcan't, strictly speaking,listthe elements because there are an infinite number of them. Is it possible that the problem actually said "a> -4" and "a< 4"? In addition, "N" usually means thepositiveintegers. If that is the case here, the reference to "-4" is irrelevant.

The only requirement is that "a> 0" and only (-1, 2) and (0, 0)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}don'tsatisfy that.

If " ", a/b4.) 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} }.can'tbe 2. And "a/b= -1" isn't possible for for a and b both positive numbers. That leaves only "a/b= 1" and b can only be 1, 2, or 3.