To find domain:
⇒ must define what is a domain
⇒ Domain is the set of input values or the values of the x-axis of
graph that is covered by the function
Based on the definition:
⇒ 67 ≤ x ≤ 78 is the domain of the function
Answer: 67 ≤ x ≤ 78 where x is a whole number
Hope that helps!