Which of the following are never used to justify statements made in the proof of a new theorem?

Question

a. definitions
b. postulates
c. conjectures
d. previously proven theorems

true or false:

2. When using an indirect proof, we show that the negation of the desired conclusion leads to a contradiction.

3. Postulates are accepted as true without proof.

Thanks! If you can get all 3 of my questions answered correctly first then you get 10 points! :)

thank you rustskipper! you get 10 points!

Answer 1

C.
True
True

Answer 2

C
TRUE
TRUE

i got them too... i guess i get 2 points? well whatever... if u wan give me 10 the other guy isnt gonna check... haha