Answer
23
Work Step by Step
Since the measures of angles 1 and 2 add to get the measure of angle ABC, it follows:
$$ 2x+3 + x= 72 \\ 3x+3 =72 \\ 3x= 69 \\ x=23$$
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 - P.3 - Informal Geometry and Measurement - Exercises P.3 - Page 24: 43
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