Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - 2.2 Subsets - Exercise Set 2.2: 91

Answer

The statement is true.

Work Step by Step

Of 10,000 American adults: $M$ is the set of all 315 tattooed Democratic men. $W$ is the set of all 384 tattooed Democratic women. $D$ is the set of all 699 tattooed Democrats. A set of elements in $M$ and $W$ combined is a set of all 315 tattooed Democratic men and all 384 tattooed Democratic women, which means that it's a set of all $315+384=699$ tattooed Democrats. The set of elements in $M$ and $W$ combined is equal to set $D$.
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