The domain of the following relation: r: {(−3, 4), (5, 0), (1, 5), (2, 8), (5, 10)} is:

a.) {−3, 1, 2, 5}
b.) {4, 0, 5, 8, 10}
c.) {−3, 5, 1, 2, 5}
d.) no domain exists

The domain of the given set of numbers are the values of abscissa. From the given the values of the abscissa are: -3, 5, 1, 2. Therefore, the answer to this item is letter A. 5 need not be written twice. 

Bc equals mb that should be your answer