If 1/2 gallon of milk cost $1.64 what is the cost per pint

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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.

Need showing work for this problem 56.25 ×25.80