47-52 Intervals Express the interval in terms of inequalities, and then graph the interval.
To express: The interval in terms of inequalities and then graph the interval.
The given interval is .
If , then the open interval from a to b consists of all numbers between a and b and is denoted as . Using set builder notation we can write as . The graph is
The parentheses ( ) in the interval notation and the open circles on the graph indicate that endpoints are excluded from the interval.
The closed interval from a to b consists of all numbers between a and b and also includes the endpoints a and b and is denoted as . Using set-builder notation, we can write as
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