Answer
$1$
Work Step by Step
The average resistance to happiness at age 20 is, $R=4.6-0.02(20)=4.2$
The average resistance to happiness at age 70 is, $R=4.6-0.02(70)=3.2$
The difference is $4.2-3.2=1$
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 1 - Section 1.1 - Algebraic Expressions, Real Numbers, and Interval Notation - Exercise Set - Page 14: 92
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