Verified Answer :

7) 3(x + 1) + 2
3x + 3 + 2
3x + 5

Answer: A

10) Commutative property of multiplication is that you can order the addends in any order and you get the same product. 

Answer: B

12) a is the answer.

10-B because comunitive shows that two numbers can be multiplyed in either order 
7-A because 3(x+1)+2 you used distributive property so you take 3x and 31 to equal 3x+3+2 then you add 3+2 to equal 5 so 3x+5
12-A because the distance stays the same while the cost depends on the distance

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