Answer
$-20$
Work Step by Step
A temperature below zero means the value is negative.
Thus, $20^o$ below zero means $-20$.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.3 - The Real Numbers - Exercise Set - Page 41: 1
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