Question

when is an open circle used? > or ≥ < or ≤ < or > ≤ or ≥ rewatch

Explanation:

When graphing inequalities on a number line, an open circle is used to indicate that the number is not included in the solution set. The symbols \( < \) (less than) and \( > \) (greater than) mean the boundary value is excluded. For example, if we have \( x>3 \), we put an open circle at \( 3 \) on the number line. Symbols \( \leq \) (less than or equal to) and \( \geq \) (greater than or equal to) use a closed circle because the boundary value is included.

Answer:

\( < \text{ or } > \)