find the sum of the following. a. 5 by 8 +7 by 8. b. 13 by 31 + -7 by 31. c. 25 by 23 + 7 by -23​

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1. Answer:

   20,68,32

   Step-by-step explanation:

   a . 8+7=15 + 5 = 20

   b . 31+-7=24+13=37+31=68

   c . 23+7=30+25=55+(-23)=32

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