Answer
The top two layers are 10.9 cm thick,
Work Step by Step
The top layer is 64mm. Convert to cm by moving the decimal.
$64mm=6.4cm$
Add the depth of the top two layers.
$6.4cm+4.5cm=10.9cm$
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
Chapter 7 - Measurement - 7.4 Problems Solving with Metric Measurement - 7.4 Exercises - Page 508: 18
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