<u><em>Answer: a. associate property.</em></u>
Explanation: Associate property is a grouping in addition and multiply can be switch. But this question it's about the order of operations. It stands for p-parenthesis, e-exponents, m-multiply, d-divide, a-add, and s-subtract. It can also go left to right. (PEMDAS)
Like this: →
First do parenthesis first.
And then subtract left to right.
*The answer must be have a positive sign.*
Final answer:
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-Charlie