"Where do chickens go to work?" (*Please just read my question)

So I have this homework paper in Algebra titled "Where do chickens go to work?" and well I really didn't feel like doing all the work I know I'm lazy but I had a really long dia so anyways the directions say "Simplify the following expressions. The answer to each problem will match a letter that will allow you to figure out the joke" so anyways the answer is supposed to be 9 letters, does anyone have any guesses or know it?