Factor out the common binomial factor as the GCF.7m(9 - m) + 9n(9 - m)
A. m(7 + 9n)(9 - 1)
B. (9m + 7n)(9 - m)
C. (7m + 9n)(9 - m)
D. (7m - 9n)(9 - m)
Answer: C
Mathematics
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