## College Algebra 7th Edition

a) $B \cup C$ means we are looking at what is included in both sets. C considers all numbers from $5$ inclusive to $-1$ inclusive. $B$ is all numbers less than 4. When conjoining these sets, we get (-∞, 5]. b) $B \cap C$ means the intersection and the intersection is between $-1$ and $4$ BUT, the set is noninclusive. $(-1,4)$