To model the equation \(-x + 40 = x\), we need to create a real-world scenario that translates to this format.
The problem "The number of days that the temperature has been below zero is 40 fewer than the number of days the temperature has been above zero" fits this model well.
In this scenario,
- Let \(x\) represent the number of days the temperature has been above zero.
- Then \(-x\) represents the days below zero, and since it is stated that this amount is 40 fewer than the days above zero, we set up the equation as:
\[ -x + 40 = x. \]
Thus, the correct response is: The number of days that the temperature has been below zero is 40 fewer than the number of days the temperature has been above zero.