What can you use deductive rules for

this is what i found Answer and Explanation: In geometry, you can use deductive rules to prove that a given statement or conjecture is true or false using deductive reasoning. We use deductive rules, such as definitions, postulates, and other theorems, in a logical order to narrow down a result proving a statement must be true or false.

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39mph

step-by-step explanation:

the answer is 99.