I need help with history assignment

read the excerpts from the book: The Prince (chpt 11, 14, 15-19, and 23) 

answer the following questions: 

1. How does Machiavelli's advice concerning The Prince's conduct in chapters 15-19 conflict with the advice previous writers would have given?
2. what does Machiavelli think of a human nature?
3. Interpret and explain the phrase "the ends justify the means"

Answer the questions in ESSAY FORM in a length of a page and half,  include introduction, body and summary. Preferable to use a statement in the introduction to start the essay. Answer all questions mentioned above.