Answer
They have lost $4yd$ in total.
Work Step by Step
First they gained $13yd$ and then the lost $17yd$.. $$13 + (-17) = -4yd$$
They have lost $4yd$ in total.
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 - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 638: 19
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