Lumen OHM Assessment

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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

$2 lt x le 5 \ "or" \ x gt 7$

Rewrite in interval notation:

all real numbers that are less than -23.