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).
Facebook does not offer a way for you to see friend-requests that you previously rejected explicitly or deleted. If you have following activated, and if the person who you declined didn't unfollow you (manually), you should find that person in your followers, from where you can send a friend request.