Is it Academic Dishonesty?

Your professor assigns a paper on a topic you've written on for a different class. Since you're the author, it's ok to re-use the paper as long as you change the title page.

You decide to team up with a classmate on your papers. Since you're writing separate papers it's ok to share all your ideas and sources.

You find a source you like but the author does not say quite what you want. You decide to change the quote but still attribute it to the author, this is ok since you are still citing the author.

You and a friend split the assigned problems and each work on half. You A both swap the completed answers and submit ALL the problems as your own work. Is this a breach of academic integrity?

4: With your permission, a friend copies a substantial portion of a research paper you submitted for a course last year. Are you guilty of a breach of academic integrity