isiah is saving up $1000 for a trip. He already has $550 saved and plans to save an additional $50 each month. how many months (m) will it take him to save up $1000?

First, subtract.
1000-550=450
This is the amount of money Isaiah needs to save.

Next you divide to find out how many months it takes.
450/50=9
If he saves $50 a month, and he needs to save $450 more, than it will take 9 months.

The answer is that Isaiah will take 9 months to earn a total of $1000

Hope this helped!