Answer :
Roberto delivers a total of [tex]$252$[/tex] newspapers and has already delivered [tex]$197$[/tex], so he has
[tex]$$252 - 197 = 55$$[/tex]
newspapers left. We can check his calculation with the following equations:
1. First, if we add the newspapers already delivered and the ones left, we should get the total:
[tex]$$197 + 55 = 252$$[/tex]
This correctly confirms the calculation.
2. Another way is to subtract the remaining newspapers from the total to see if we recover the number already delivered:
[tex]$$252 - 55 = 197$$[/tex]
This also confirms his subtraction is correct.
Thus, the equations that verify his calculation are
[tex]$$197+55=252$$[/tex]
and
[tex]$$252-55=197.$$[/tex]
[tex]$$252 - 197 = 55$$[/tex]
newspapers left. We can check his calculation with the following equations:
1. First, if we add the newspapers already delivered and the ones left, we should get the total:
[tex]$$197 + 55 = 252$$[/tex]
This correctly confirms the calculation.
2. Another way is to subtract the remaining newspapers from the total to see if we recover the number already delivered:
[tex]$$252 - 55 = 197$$[/tex]
This also confirms his subtraction is correct.
Thus, the equations that verify his calculation are
[tex]$$197+55=252$$[/tex]
and
[tex]$$252-55=197.$$[/tex]
