ENTERING INTERVAL ANSWERS

For intervals of values, enter your answer using interval notation. Here are some examples of how interval notation relates to inequalities:

Inequality	Interval Notation
`3 lt x lt 5`	(3,5)
`3 lt x le 5`	(3,5]
`x gt 3`	`(3,oo)`
`3 lt x lt 5 \ "or" \ 7 lt x lt 9`	`(3,5)uu(7,9)`

With inequalities, we use "less than": < or "greater than": > to exclude the endpoint of the interval. With interval notation, we use use round parentheses, ( or ).

With inequalities, we use "less than or equal to": ≤ or "greater than or equal to": ≥ to include the endpoint of the interval. With interval notation, we use use square brackets, [ or ].

To combine two intervals, use U (an uppercase letter u) for union: `uu`
Use oo (two lowercase letter o's) for infinity: `oo`

For example, to enter `(-oo,-2]uu(3,6]`, you would type: (-oo,-2]U(3,6]

Try it now. Enter the interval equivalent to `2 lt x le 5 \ "or" \ x gt 7`