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

InequalityInterval 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