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 (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 1 - Review Exercises - Page 74: 21
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