Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

Chapter 9 - Inequalities and Problem Solving - 9.2 Intersections, Unions, and Compound Inequalities - 9.2 Exercise Set - Page 591: 99

Answer

The answer is below.

Work Step by Step

The union of two sets includes all values in either set, but repeated values are only listed once. Thus, if we are left with $a$ and $d$, we see that $a$ and $d$ must be equal to $b$ and $c$.

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