I need help fast please help I’ll give 30 points

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

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.

What is mean median mode and range?