Holly finds that open paren 11 m minus 13 n plus 6 m n close paren minus open paren 10 m minus 7 n plus 3 m n close paren is equal to m minus 20 n plus 9 m n What error did Holly make?
Answer
A
She did not combine all like terms.
B
She only used the additive inverses of negative 7 n and 3 m n when combining like terms.
C
She added the polynomials instead of subtracting.
D
She only used the additive inverse of 10 m when combining like terms.