Answer
$r=10,\qquad D=75$ dB,
$r=20,\qquad D=69$ dB,
$r=50,\qquad D=61$ dB
Work Step by Step
Calculate $D$ for each value of $r$. See below.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 9 - Section 9.3 - Logarithmic Functions and Models - Exercises - Page 660: 67a
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