Answer
130 ft above sea level
Work Step by Step
To find the solution add the distance of the person above the lake to the elevation of the lake.
-512+642=130 feet above sea level
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 1.5 - Addition of Real Numbers - Exercise Set - Page 63: 74
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