Answer
EC=16.8
Work Step by Step
$\frac{AD}{AE}$=$\frac{DB}{EC}$
$\frac{5}{7}$=$\frac{12}{EC}$
5EC=84
EC=16.8
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 5 - Section 5.6 - Segments Divided Proportionally - Exercises - Page 266: 9
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