Applications folder gone from dock

Howdy. I tried opening finder, command I, then command X, based on a forum suggestion I read from 2008, but that didn't work. I'm trying to restore the folder to my dock. I can now only open applications through finder. And to be clear, I'm talking about applications that came with the mbp, not from the apps store. Thanks!

 

I searched for disc folder, and really could not find my applications in what popped up. Thanks for your time, but that didn't help. I could be looking in the wrong place.