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 5 3 5 x 3 3 3 x 5 or 7 x 9 3 5 U 7 9 3 x 5 3 x 5 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 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