Question

1. an informal proof uses ______________ to show that a conjecture is true.

geometry rules
algebra rules
specific examples
theorems

Explanation:

An informal proof is less structured than a formal proof. Geometry rules and algebra rules are more formal. Theorems are proven statements used in formal proofs. Specific examples are used in informal proofs to show a conjecture might be true (though not as rigorously as a formal proof).

Answer:

C. specific examples