Pls help me Part A: Is the side length 20−−√+3 rational or irrational?

Part B: The expression 2(20−−√+3)+5–√ can be used to find the perimeter of the triangle. What does the "2" represent in this expression?

Part C: What is the perimeter of the triangle in simplest form? In order to earn full credit, show your work using a method explained in the Orientation.