The answer would be D if it was 250-6-3n. it wouldnt be A or C because 9 isnt anywhere in the problem and it wouldnt be B because she used 6 peices of paper she didnt just give it to her students
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7 is the right answer(please rate 5.0 stars so i can help other people out thanks)
The simplified equation is 2ab, so the coefficient would be 2.