Question

SOMEBODY help me with these investment math problem , what is the domain of the following relation?
{(a, b), (b, c), (c, a), (a, c), (c, d)}

Answer 1

the domain is simply the list of x coordinates of each point

so you list the first number of each ordered pair (toss out duplicates)

Answer 2

{a, c, d} ah is that the thing ?/