Answer
${{\$}} 0.61$
Work Step by Step
The point $(1.5, 0.61)$ lies on the graph, so $f(1.5)=0.61$
Mailing a $1.5$ ounce first-class letter costs ${{\$}} 0.61.$
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 2 - Section 2.2 - Graphs of Functions - Exercise Set - Page 124: 51
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