On what grounds does Descartes doubt evidence from his sense? People say, “Seing is believing.” Would Descartes agree? why?

Rene Descartes : Mediation
1. On what grounds does Descartes doubt evidence from his sense? People say, “Seing is believing.” Would Descartes agree? why?
4. Why does Descartes want to try to doubt everything ?
Does he think that even mathematical truths like 5 + 2 = 7 are doubtful? Why?
5. Why does Descartes want to try to doubt everything ?
8. What does he try to show using the piece of wax?
11. There is one thing about which Descartes is absolutely certain. What is it? How can he be so certain of this?

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