## Precalculus (6th Edition)

$\color{blue}{C \cup E = \left\{1, 3, 5, 7\right\}=E}$
Given: $C=\left\{1, 3, 5, 7\right\}$ $E=\left\{3, 7\right\}$ RECALL: $C \cup E$, the union of sets C and E, is the set that contains the combined elements of sets C and E. Thus, $\color{blue}{C \cup E = \left\{1, 3, 5, 7\right\}=E}$