The function f(x)=5x+4 is one to one find an equation for f^-1 (x). the inverse function. f^-1 (x)= me w this ill give u brainliest

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.