Answer
+20 ft
Work Step by Step
The river is 20 ft above the flood stage. Above means 20 is greater than 0 so put + sign before 20 or don’t put any sign.
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.1 Signed Numbers - 9.1 Exercises - Page 628: 6
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