answer this question 1. 2s+7-6+s 2.9r+10+2-3r 3.12m-5-8m+8-3m

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1. 2s+7-6+s
= 2s+s+7-6
= 3s+1
2. 9r+10+2-3r
= 9r-3r+10+2
= 6r+12
3. 12m-5-8m+8-3m
= 12m-8m-3m-5+8
= m+3