Answer: 
 
{0 ≤ h ≤ 25} 
 
Step-by-step explanation: 
 
The domain of a function is the set of all values for independent variable for which the function must be defined. 
 
Given: The amount earned by Hailey for one hour work =$9.50 
 
She determines that her salary is modeled by the function . 
 
Here h is the independent variable such that 's' is dependent on 'h'. 
 
Since she never works more than 25 hours in a week. 
 
Therefore, the maximum hours she will work = 25 
 
Hence, the domain of this function in this situation is {0 ≤ h ≤ 25}, where h is number of hours she works.