How does Descartes satisfy himself of his own existence?

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You can type the answer right under each question. 

The attachment is where you can find the answers.

 1.  Descartes proposes four rules to be followed in any investigation of an issue or problem. What are they?

2.  Descartes also offers three or four moral principles to be followed while pursuing ultimate questions. What are they?

3.  How does Descartes satisfy himself of his own existence? That of God? Of the universe?

4.  To what extent may life – human and animal – be regarded as mechanical, and how does this machinery function?