Answer
10 seconds
Work Step by Step
h(t)=-16t^2+1600
Factor
-16(t^2-100)
-16(t+10)(t-10)
t+10=0 t=-10 Negative time does not make sense
t-10=0 t=10
After 10 seconds the sunglasses hit the ground.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.8 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 324: 79
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