Question

Explain, in complete sentences, when you would use an open circle or a closed circle, and when you would shade to the right or left, to graph an inequality on the number line.

@radar ?

Answer 1

My old book does not use that form. But on the number line:
They use those symbols to indicate inclusion or exclusion. For example for a quantity that is larger than -3 but less than or = to 2, it would appear as follows