Inactive Tutor answered 01/10/23
To find out how many baseballs cards Josh has now, we need to add up how many he had yesterday and how many he got today.
m is the amount he had yesterday. He got 25 today. So it's m + 25. We don't currently know the total number of baseball cards he has today, so we can let another letter represent this amount, like x, for example. So the full expression is m + 25 = x.