Answer
$10$
Work Step by Step
The points closest to the center of the hyperbola are the vertices. That is the shortest horizontal distance from the plane.
So, we find that $a=10$.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 4 - 4.3 - Conics - 4.3 Exercises - Page 339: 83
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