Purdue's campus is situated in the small city of West Lafayette, near the western bank of the Wabash River, across which sits the larger city of Lafayette. State Street, which is concurrent with State Road 26, divides the northern and southern portions of campus.
People who have sent you friend requests are visible by clicking the friend request icon in the menu bar. Friend requests you have sent are visible in your Activity Log, using filter Friends: (you may have to click more to see it).
You can't. FB don't provide a notification to a friend-requester that so-and-so declined your friend request, but they could infer it by looking at their activity log or even at your profile (the add friend button would return). On the other hand, it's pretty obvious to them that you haven't accepted the friend request either. I have a few friend requests that I've just left sit there in friend request limbo for years. Other people have done it to me. Whatever, it's FB.