In the problem you are asked to find a function that models a real life situation. Use the principles of modeling described in this Focus to help you. 9. Radius Find a function that models the radius...

In the problem you are asked to find a function that models a real life situation. Use the principles of modeling described in this Focus to help you.

Extracted text: 9. Radius Find a function that models the radius r of a circle in terms of its area A.