The image you provided shows a number line representing an interval, which is a segment of the real number line. The segment appears to start at $-1$ and ends at $4$, and it includes these key characteristics:

• The line segment starts at $-1$ and extends to $4$.
• The bracket on $4$ is square (closed interval), meaning that $4$ is included in the interval.
• The parentheses at $-1$ are rounded (open interval), indicating that $-1$ is not included in the interval.

Based on this, the interval can be written in interval notation as: $(-1, 4]$

This represents all numbers greater than $-1$ and less than or equal to $4$.

Would you like further explanation or have any questions? Here are five questions related to this concept:

1. How do you represent an open interval and a closed interval in set notation?
2. What is the difference between an open and a closed interval?
3. How would you graph the interval $[1, 5)$ on a number line?
4. Can a number line represent multiple intervals at once?
5. How can intervals be used to describe the solution sets of inequalities?

Tip: When solving inequalities, always pay attention to whether the boundary values are included (closed intervals) or excluded (open intervals).