Answer
15 books
Work Step by Step
Letting $x$ be the number of books that she ordered, we find:
$$ 1.8+2.19x=34.65\\ 180+219x=3465\\ 219x=3285 \\ x=15$$
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 1-6 - Cumulative Review - Page 440: 43
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