Subtract-a^2-5ab+3ab^2 from 3a^2-2ab+3b2

The circumference of a circle is 5 pi cm. what is the area of the circle?

What are the values of each variable in the diagram below?

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.