13. C we substitute AC +CB in place of AB
14. C reflexive
16. B Inductive reasoning. She uses specific info that her tallest son shorter than 40 inches. She uses this to generalize that the rest of her children must all be shorter than 40. Therefore they may all go to the playground.
17. B Deductive reasoning. Given the general pattern, the baker comes to think that the specific action Keith will take tomorrow will be to buy doughnuts.
18. Symmetric property of equality. A
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