Final answer:
The domain of d in the given problem is time (T) in minutes since Tanya left home and is the set of all real numbers greater than or equal to 17.
Step-by-step explanation:
The domain of d in the given problem is time (T) in minutes since Tanya left home.
Since Tanya walked for 17 minutes, the domain of d is the set of all real numbers greater than or equal to 17.