Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 7 - Measurement - Review Exercises - Page 523: 21



Work Step by Step

My thumb is 20 mm wide. As we know the thumb length can be measured in km, m, cm, and mm. If we choose 20 km, 20 m or 20 cm it will be too long for the length of the thumb so 20 mm is the correct choice.
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