Chapter 3 - Solving Inequalities - 3-8 Unions and Intersections of Sets - Practice and Problem-Solving Exercises - Page 219: 33

$W ∪ Y ∪ Z$ = {0, 2, 3, 4, 5, 6, 7, 8}

In unions, we must include all elements in the sets that are specified. Therefore, we will list all the elements of $W$, $Y$, and $Z$. We need to list all elements in $W$ and $Y$ and add any whole even number that is less than $10$ and not included in the other two sets; this includes $0$ and $4$: Let's list all the elements in all three sets: $0, 2, 3, 4, 5, 6, 7, 8$ Let's write the numbers in set form: $W ∪ Y ∪ Z$ = {0, 2, 3, 4, 5, 6, 7, 8}