Baffling Questions from College Students

I'm a librarian at a small college.
  1. I can rent these books?
    Also, like, shouldn't "rent" be phased out as a word by now for millenials as it pertains to products, or are they just using it snarkily in regards to how dated they view the library generally?
  2. You mean CTRL+C will copy and CTRL+V will paste?
  3. Wait, so renting these books is totally free?
  4. What do the numbers on the spine of this book mean?
  5. I don't think I'll find anything about tentacle porn in the library, but the teacher said we had to ask a librarian about our research paper.
    He was wrong. We found scholarship on tentacle porn. #norules #library