9 1/5 into an improper fraction

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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.

Prove that 16^4-2^13-4^5 is divisible by 11.