Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 1 - Sections 1.1-1.8 - Exercises - Problems by Topic - Page 40: 74b

Answer

7.20 cm

Work Step by Step

The 7 cm mark and the 0.2 marks are clearly marked on the ruler, while the 0.00 was estimated. When measuring, you use all certain digits (in this case the 7 cm and the 0.2 cm) and estimated to one more digit (in this case the zero after the .2)
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