Which table of values represents a function?

Which value would be a solution for x in the inequality 47-4x< 7

Using elimination, what is -4x+2y=-12 4x+8y=-24

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.