Answer
$W\cap X\cap Z$ ={6}
Work Step by Step
$W\cap X\cap Z$ is the intersection of the 3 sets. To be included in the intersection, a member must appear in all 3 of the sets.
W={5, 6, 7, 8}
X={3, 6, 9}
Z={0, 2,4, 6, 8}
Eliminate the members that do not belong to all 3 sets.
$W={/\!\!\!5, 6, /\!\!\!7, /\!\!\!8}$
$X=\{/\!\!\!3, 6, /\!\!\!9\}$
$Z=\{/\!\!\!0, /\!\!\!2, /\!\!\!4, 6, /\!\!\!8\}$
6 is the only member that appears in all 3 sets, so the intersection is {6}.
