8m + 4n + 7m - 2n
You wouldn't have any trouble with this at all if it said
8monkeys + 4nuts + 7monkeys - 2nuts
First you would look through it to see how many monkeys there are all together. You would addum up.
8monkeys + 7monkeys = 15 monkeys
Then you would look through it to see how many nuts there are all together, and you would addum up.
4nuts - 2nuts = 2 nuts
Then you would write these results on one line:
15monkeys + 2nuts .
Why should it be a big tough deal when there's just a bunch of m's and n's ?
First, just look through it to see how many m's there are all together, and addum up:
8 m's + 7 m's = 15 m's
Then just look through it to see how many n's there are all together, and addum up:
4 n's - 2 n's = 2 n's
Then write these results on one line:
15 m + 2 n .
That's choice-c .