Answer
$cm$
Work Step by Step
They talk about a measure of length, a book has a high of $30cmm$ approximately, so the most reasonable length for a bookcase is $cm$.
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
Chapters 1-8 - Cumulative Review Exercises - Page 621: 20
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