Answer
4.9
Work Step by Step
Looking at the segment, we see that segment AB and segment BC make up the entire segment AC. Thus, we know:
$$ AC=AB+BC \\ AB = AC-BC $$
Therefore, it follows:
$$ AB = 12.3 -7.4 \\ AB=4.9$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - Chapter P Review Exercises - Page 29: 38
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