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).
Another way to find out that they have declined the friend request after you have sent one is to check that person's profile and it should say add friend again that another way of finding out that they have declined the friend request. But I can't find my find friends button because i have exceeded the amount in which the button can be found...