To find out how much the value of the car decreases each month, you can use division of rational numbers. In this case, you need to divide the total decrease in value by the number of months.
The total decrease in value over 6 months is $2,500. To find the monthly decrease, you divide $2,500 by 6:
\[ \text{Monthly decrease} = \frac{2500}{6} \]
Calculating this gives:
\[ \text{Monthly decrease} \approx 416.67 \]
Therefore, the value of the car decreases by approximately $416.67 each month.