Answer
m$\angle$DBC=47$^{\circ}$
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$^{\circ}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Review Exercises - Page 65: 21
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