The image shows a number line with the interval shaded from $-10$ to $2$, both included (since the points at $-10$ and $2$ are solid dots).

In interval notation, this is expressed as: $[-10, 2]$ The square brackets indicate that both endpoints are included.

Would you like a more detailed explanation of interval notation, or do you have any further questions?

Here are 5 related questions for practice:

1. How would you express the interval if $-10$ was not included but $2$ was included?
2. What is the interval notation for all numbers greater than $2$?
3. How do you write the interval from $-8$ to $5$ if neither endpoint is included?
4. How would you express the interval from $0$ to $\infty$ (infinity)?
5. What is the meaning of open and closed intervals in interval notation?

Tip: When using interval notation, always use square brackets $[ ]$ for included endpoints and parentheses $( )$ for excluded endpoints.