Question

For the following graph,express the interval shown using interval notation?

Answer 1

The interval notation is;

`(-\infty,4]`

Explanation:

The solution set of the inequality represented on the number line is

`x\le4`

The boundary 4 is inclusive in the solution set, so we use square bracket "[ ]" to show inclusion and open bracket "()" to show that, that part of the interval in not bounded.

In interval notation, we can write this as;

`(-\infty,4]`

Repeated