Answer
$t=5$
Work Step by Step
We set $h$ equal to $0$:
$0=-16t^{2}+400$
$16t^{2}=400$
$t^{2}=25$
$t=5$ or $t=-5$
We know that $t$ can not be negative, so the only possible value of $t$ is $5$
$t=5$
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 466: 14
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