What is the domain? Algebra

1.) Given the relation {(2,4), (1,5), (-1, 8), (1,0)}, what is the domain?
{1, 4, 2}
{1, -1, 5}
{1, -1, 2}
{4, 8, 1}

2.) For the relation given in Question #1, what is the range?
{4, 5, 8, 0}
{4, 8, 1}
{5, 1, 0}
{4, 8, 1, 2}

3.) Is the relation, given in Question #1, a function?
Yes
No
Maybe
Sometimes

4.) Given the relation {(-2,10), (0,5), (1/2,1), (3,10)}, what is the domain?
{ 0, 1 , 10}
{-2, 3, 0, 1}
{1/2, 5, 0, 3}
{3, 0, -2, 1/2}

5.) For the relation given in Question #4, what is the range?
{10, 5, 0}
{1, 10, 5}
{1, 1/2, 5}
{10, -2, 5}

6.) Is the relation, given in Question #4, a function?
Yes
No
Sometimes
Maybe

1. Domain = -1, 1, 2
2. Range = 0, 4, 5, 8
3. No.
4. Domain = -2, 0, 1/2, 3
5. Range = 1, 5, 10
6. Yes.

1) {1,-1,2}
2) {4,5,8,0}
3) No
4) {-2,0,5,1/2,3}
5) {10,5,1}
6) yes