Tell whether the ratios form a proportion
8/5, 24/15

Iam so stuck. what is the worked out answer for this question?

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.

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.