Answer
AD=40
Work Step by Step
$\frac{AD+DC}{BC}$=$\frac{BC}{DC}$
$\frac{AD+5}{15}$=$\frac{15}{5}$
AD+5=45
AD=40
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 5 - Review Exercises - Page 274: 31b
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