Find domain and range

Let’s say our ordered pairs was {4,5} {7,10} and {12,5} Our domain is the first numbers within the pairs meaning {4,712} our range would be the second numbers {5,10} we don’t write either the domain or range twice if it’s already included once. Hope this helps a bit, i can’t see the problem to clearly, so here’s an explanation to how to use it

Something that is true about that is that it has numbers