Answer
$3$
Work Step by Step
$ \log 25 +\log 40 = \log (40 \cdot 25 )$
or, $=\log (1000)$
or, $= \log 10^3$
or, $3 \log 10 = 3 \times 1 =3$
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 4 - Cumulative Review Exercises - Page 647: 9
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