Answer
$3$ years in a relationship, when it is $9$.
Work Step by Step
According to the graph, the level of intensity of passion is the highest at $3$ years in a relationship, when it is $9$.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 4 - Section 4.1 - Solving Linear Inequalities - Exercise Set - Page 263: 53
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