Answer
$112$ decibels
Work Step by Step
We are given that $ y=\dfrac{k}{x^2}$
Thus, $28=\dfrac{k}{(8)^2} \implies \dfrac{k}{64}=28$
so, $ k=1792$
This implies that $ y=\dfrac{1792}{16}$
or, $ y=112$ decibels
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 2 - Review Exercises - Page 433: 96
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