Advanced Math practice question

Answer: A. 5m + 4

2m + 3m = 5m, and the 4 has no m to combine with.

Why the other answers are wrong

B. 9m

9m wrongly folds the constant 4 into the m-terms.

C. 5m + 4m

5m + 4m would be 9m and treats 4 as 4m.

D. 6m + 4

6m multiplies 2 and 3 instead of adding.

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