To interpret the expression \(2.5x + 10\):
- The term \(10\) represents the entry fee for the car (a fixed cost).
- The term \(2.5x\) represents the individual fees for both Julio and Ashley, where \(x\) is the number of individuals (in this case, \(x\) would be 2 since there are two of them).
Thus, the correct interpretation of a part of the expression is that the entry fee for the car was $10.