1. Two websites that I believe are likely to use databases would be the Library of Congress (loc.gov) which stores data 
in the form of books and records; another website would be imdb.com which is an internet movie database. 
2. Department -> Professor -> Course -> Classroom. Department -> Course. Classroom -> Course
3. Many-to-one Relationships: department -> everything, Professor -> course, Classroom -> Course 
   One-to-many Relationships: None of the above.
4. The radio station my have the entities of Artitst, Song Title, Year Recorded, and Album. 
5. Query results and Tables are different in that Query results are the results of specific questions, tables are just how they are laid out.