Mr. Green told Ms. Jang that the -k is- 1. What you tell one of you classmates that the coefficient of -k/5 is? I really do not understand this pls help its due tonight​

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.