5. If x, ye{0, 1, 2, 3, 4, 5} Then, which of the following are function in the given set?
(a) f1 = {(x, y): y = x - 1}
(b) f2 = {(x, y) : x + y < 3}
(c) fs = {(x, y): x > y}
(d) fa = {(x, y) : x + y = 4}

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points