The length of a rectangle is 6 inches the width is 3w inches if the coefficient of the width increases by 2 what could be an expression for the area of the rectangle

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.