Answer
The total is a 20 yard gain.
Work Step by Step
Write the question as a numerical expression by adding the gain or loss from each year, and add from left to right.
-13 + 12 + 21
= -1 + 21
= 20
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - 1.5 Addition of Real Numbers - 1.5 Exercise Set - Page 42: 65
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