Hailey has a summer job at the water slide park. she earns $9.50 an hour as a lifeguard, but never works more than 25 hours in a week. she determines that her salary is modeled by the function s = 9.5h. what is the domain of this function in this situation? a) s ≤ 237.50 b) all real numbers c) {0 ≤ h ≤ 25} d) {0 ≥ h ≥ 25}