Answer
A∩D={1,3}
Work Step by Step
A={1,3,4}
D={1,3,5,7,9}
A∩D contains all elements that are in both A and D. If an element is only in A or only in D, it is not in the intersection of A and D.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 3 - Solving Inequalities - 3-8 Unions and Intersections of Sets - Practice and Problem-Solving Exercises - Page 218: 18
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