Answer: The fourth donation was $250
Step-by-step explanation: Note that doantions are recorded as positive values and the costs are recorded as negative values. They received four donations and used up all money collected without any leftover.
The donations received were as follows;
250 + 1000 + 500 + x
The total amount spent was 2000 (recorded as a negative value)
Therefore the fourth donation which is x can be calculated as follows;
250 + 1000 + 500 + x = 2000
1750 + x = 2000
Subtract 1750 from both sides of the equation
x = 250
The value of the fourth donation is $250