Answer
9
Work Step by Step
Using the Pythagorean theorem, we find:
$$a=\sqrt{c^2-b^2} \\c=\sqrt{15^2-12^2} \\ a=9$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 12 Sequences and Series - 12.5 Use Recursive Rules with Sequences and Functions - 12.5 Exercises - Mixed Review - Page 833: 51
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