Question

Which of the following describes the graph of {x | x ≤ 1} U {x | x ≥ 4}?


closed circles on 1 and 4 with a line segment between
closed circles on 1 and 4 with arrows pointing outward
the entire number line
no solution

i got D

Answer 1

No, not D.

\(\left\{x~|~x\le1\right\}\) and \(\left\{x~|~x\ge4\right\}\) is the same as \(1\le x\le4\).