Answer :
Answer:
6m-mn, or 5m-n.
7y+42+5y+30, or 12y+72.
Not sure exactly what you're asking for the third and fourth, but these are the first two simplified.
Answer:
6m-mn, or 5m-n.
7y+42+5y+30, or 12y+72.
Not sure exactly what you're asking for the third and fourth, but these are the first two simplified.