Answer
15.4
Work Step by Step
$\frac{6}{a}=\frac{7}{7+11}$ Take similar triangles and correspond the sides
$\frac{6}{a}=\frac{7}{18}$
7a=108
a=15.4
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 1 - Review Exercises - Page 41: 20
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