What is the range of this function?

{ (1, 2), (-3, 4), (3, 3), (0, - 9) }

The function is somewhat like this:

Set A = {1, - 3, 3, 0}

Set B = {2, 4, 3, - 9}

The mapping is:

1 is mapped to 2

-3 is mapped to 4

3 to 3

0 to - 9

Range is therefore the elements of the second set {2, 4, 3, - 9}