#### Answer

(a) A $\cup$ C={1,2,3,4,5,6,7,8,9,10}
(b) A $\cap$ C={7}

#### Work Step by Step

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) A $\cup$ C={1,2,3,4,5,6,7,8,9,10}
(b) A $\cap$ C={7}