Chapter P, Prerequisites - Section P.2 - Real Numbers - P.2 Exercises - Page 16: 42

(a) B $\cup$ C={2,4,6,7,8,9,10} (b) B $\cap$ C={8}

A union of sets includes all of the numbers of both sets. An intersection of sets includes all common numbers that are a part of both sets. (a) B $\cup$ C={2,4,6,7,8,9,10} (b) B $\cap$ C={8}