Kareem has 7 pieces of paper cut into squares. He wants to find the perimeter of each square. Write a rule for a function, P, that gives the perimeter of a square in inches when the side length is x inches that will help Kareem. Write your rule in function notation. Was there any extra information in problem #3 you didn’t use to write your function? Explain.

What is the value of P(9.1)? What does it tell us about the side length and perimeter of the square?