The number line provided shows an interval from $-6$ to $0$. There is an open circle at $-6$, meaning $-6$ is not included in the interval, and a closed circle at $0$, meaning $0$ is included.

In interval notation, this is written as: $(-6, 0]$ This represents all the numbers greater than $-6$ and less than or equal to $0$.

Would you like further explanation or have any questions?

Here are 5 related questions to practice:

1. How would you write the interval if both $-6$ and $0$ were included?
2. How is a closed circle different from an open circle in interval notation?
3. What would the interval notation be if the open circle were at $0$ and the closed circle at $-6$?
4. How do you express an interval where both endpoints are excluded?
5. How would you write the interval if it extended to infinity?

Tip: In interval notation, use parentheses $( )$ for values not included and brackets $[ ]$ for values included.