Spinoza + Descarte

Please answer one question in each section (one on Descartes and one on Spinoza).
Descartes:

  1. Explain the "deceiving God" argument Descartes presents in the first Meditation: why is this argument necessary after the "dream argument", and
    what survives this argument?
  2. Why does Descartes attempt to prove the existence of God? What is the role of God in his philosophical system?
    Spinoza:
  3. How does Spinoza demonstrate his claim that nothing exists outside of God?
  4. Explain Spinoza's argument for the existence of God.