Do you add or multiply when finding area

Find x & pleassse me !

3.(03.01)the domain of the following relation r {(6, -2), (1, 2), (-3, -4), (-3, 2)} is (1 point)o {-4, -2, 2)^{-3, -3, 1,6}{-4, -2, 2, 2){-3, 1, 6)4.(03.01)dulan created color nanele for a wall usinn a mix of only arepn and blue naints haplotted the quantidescription+

Renting a room at the willow tree resort costs $125 for 2 people. each additional person is $25. write an expression that shows the cost for n extra people