In which set of points is y a function of x? A) A) {(1, -2), (0, 1), (1, 1), (1, 2)} B) {(1, 2), (0, 1), (1, 2), (-1, 1)}
C) {(2, -1), (0, 1), (1, 0), (2, 1)}
D) {(2, 2), (1, 1), (0, 1), (1, -1)}

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.