Questions 1, 2, & 4:
http://www.scholastic.com/browse/article.jsp?id=4684
https://www.ducksters.com/history/us_executive_branch.php
Question 3: https://www.scholastic.com/teachers/articles/teaching-content/seven-roles-one-president/
Question 5: http://www.presidential-power.org/presidential-succession.htm