Question

Which company quality is represented by the graph?

Answer 1

Answer: Choice A)
`-3 \le x < 1`

The reason why is because we have a closed circle at -3 and an open circle at 1. The closed circle means we include this as part of the solution set. An open circle means we exclude the endpoint.

So x is between -3 and 1, including -3 but excluding 1.

We could write
`x \ge -3 \ \text{ and } \ x < 1` but its much more compact to write
`-3 \le x < 1`