Final answer:
A closed circle on 2 to 6 represents an interval on the number line that includes both 2 and 6.
Step-by-step explanation:
The question is referring to a closed circle on the number line from 2 to 6. In mathematical notation, this can be represented as [2, 6]. The closed circle indicates that the endpoints, 2 and 6, are included in the interval. So, the interval includes all numbers between 2 and 6, including 2 and 6.