For question 9, the most effective use of a call to action to motivate their audience is by John F. Kennedy and Dr. Martin Luther King Jr. Both authors are known for their powerful oratory that inspired action and brought attention to pressing social and political issues.
For question 10, a shared theme in "The Gettysburg Address" and "Letter from Birmingham Jail" is the importance of unity in the face of division. Both texts address the need for coming together and overcoming discord for the greater good of society.