## Precalculus (6th Edition)

$M \cup R = \left\{0, 1, 2, 3, 4, 6, 8\right\}$
The symbol $\cup$ represents union of sets. The union of sets M and R is the set that contains the combined elements of M and R. Thus, $M \cup R = \left\{0, 1, 2, 3, 4, 6, 8\right\}$.