<h2>
Answer:</h2><h2>The final thickness of the metal = 2 inches.</h2>
Step-by-step explanation:
Jonathan finds a piece of metal that is 2 inches thick.
The thickness of the metal = 2 =
He files off inch,
the thickness becomes = - =
He adds a protective covering to the metal that is inch thick.
the thickness becomes, + =
Then, he polishes the metal and removes an additional inch.
The final thickness becomes, - = 2 inches