Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 50: 133


950 m

Work Step by Step

The elevation starts at +550 m (since it's ABOVE sea level) and ends at -400 m (since it's BELOW sea level). The elevation decreases, so the number of meters the elevation falls is positive. The number of meters the elevation falls is the positive difference between the starting and the ending elevation, which is: 550-(-400) =550+400 (two negative signs make a positive) =950 m.
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