Can someone help I really need help

Which is f(5) for the function –2x2 + 2x - 3?

If a is a nonzero real number then the reciprocal of a is

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.