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 3 3 Interval Notation (3,5) (3,5] (3,) 3 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: U Use oo (two lowercase letter o's) for infinity: For example, to enter (-, -2] U (3,6], you would type: (-00,-2]U(3,6] Try it now. Enter the interval equivalent to 2 < x < 5 or x > 7