Math

What is the simplified form of the expression? 1/3(21m + 27)
A. 63m + 9
B. 7m + 9
C. 7m + 81
D. 7m + 27
i need help plz don't know how to do it.

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  1. What is 1/3 of 21m?
    What is 1/3 of 27?

  2. 7m + 9

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