Question

What is the domain of the function: {(1, 2); (2, 4); (3, 6); (4, 8)}?

Answer 1

`{1,2,3,4}`

Explanation:

The first components are Xs and the second ones are Ys, so domain are Xs and: `D_f={1,2,3,4}` where `D_f` is a domain set.