Answer: The set of integers is closed for addition, subtraction, and multiplication but not for division.
It would be 4(12 + 6). The answer to this is 7.
Hope that helps :)
<h3>
Answer: 3x+25</h3>
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Work Shown:
3(x+9)-2
3*x+3*9 - 2 ..... distribute
3x+27-2 .... multiply
3x+25 .... combine like terms
Answer: Just Simplify and add like terms
-3x - 7 + 4x +7
1x -7 +7
1x = 0
1x
x
