Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 1 - Review Exercises - Page 74: 21



Work Step by Step

m$\angle$ABD+m$\angle$DBC=m$\angle$ABC 2x+5+3x-4=86 5x=85 x=17 m$\angle$DBC=3x-4 m$\angle$DBC=3(17)-4=47$^{\circ}$
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