Answer
$$ 9i+7j.$$
Work Step by Step
We combine the vector components:
$$3j+(9i+4j)=9i+7j.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.1 Vectors in the Plane - Exercises - Page 650: 55
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