Answer
10 km
Work Step by Step
$b=2*h$
$a=b*h*1/2$
$a = 2*h*h*1/2$
$a=h^2$
$100 = h^2$
$\sqrt {100} = \sqrt {h^2}$
$h=10$ ($h\ne-10$ since we can't have a negative length)
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.7 - Quadratic Equations and Problem Solving - Exercise Set - Page 467: 31
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