French philosopher Rene Decartes tried to show that?

Answer 1

http://en.wikipedia.org/wiki/Des_cartes

Many things ... so read carefully and take good notes.

Answer 2

What are your choices?

What do you think the answer is?

Answer 3

a. Gruyere made the best cheese sandwiches.

b. all philosophical arguments were inductive arguments.

c. radical skepticism was the best approach to philosophy.

d. at least one thing could be shown to be absolutely true.