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Pearson Algebra 1 Common Core, 2011 View details

8. Unions and Intersections of Sets

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Exercise 21 Page 218

The symbol ⋂ indicates the intersection of two sets.

C ⋂ D={ 5, 7}

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Since we have the symbol ⋂, we are looking for the intersection of the given sets.

First, we will write D in roster form. D={ 1, 3, 5, 7, 9} An intersection of two sets is the set that contains elements that are common in both sets. An element is in the intersection of C and D if it belongs to C and to D at the same time. C&={ 2, 5, 7, 10} D&={ 1, 3, 5, 7, 9} C ⋂ D&={ 5, 7}