With regard to mathematics, what is an accepted statement of fact that is used to prove other statements?
a. axiomb)theroumc)definitiond)undefin ed term

The answer is B

here's why:
In mathematics, a proof is a deductive argument for a mathematical statement. In the argument, other previously established statements, such as theorems, can be used. In principle, a proof can be traced back to self-evident or assumed statements, known as axioms, along with accepted rules of inference. credit given to "mathematical" proof.com

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