Can someone plz help me with this problem

Part A
Merlin wrote 3 checks for 25 dollars each
Now she wrote one for 100 dollars
Total Change = - 175 from the total
Part B
Melody essential made a deposit for $5
She then wrote a check for ($200)
The change is the difference. -195
Part C
Merlin's account = total before any transaction - 175 dollars.
Melody's Account = total before any transactions - 195 dollars.
Next Question
5 - 5 = 0 You can subtract 5 from the original five to get 0. or
5 + (- 5) = 0