Sally pays £25 for two tubes of paint a blue tube and a red tube. the blue tube cost £7 more than the red tube. how much did each tube cost?

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.