1. [0,30]
The domain represents the amount of people. Since there is a maximum of 30 people coming to the event, and it’s impossible to have less than 0 people, the domain is [0,65]
2. [0,infinity]
Since the t values represent the subscribers, and there is no maximum amount of subscribers, the domain will be from 0 to infinity.
3. [0,13]
Here t represents time that has passed. Since the amount of pets adopted cannot be negative, 13 is the max t value. So the range is [0,13]