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 - 7.5 Metric - U.S. Measurement Conversions and Temperature - 7.5 Exercises - Page 515: 35

Answer

First, he incorrectly distributed the 5 to only one number inside of the parenthesis. Then, he incorrectly rounded 19.7 down to 19.

Work Step by Step

The correct solution, using his initial correct equation, is as follows: $$ = \frac{5(42-32)}{9} \\ = \frac{5\times 10}{9} \\ = 5.55 ^{\circ}C \\ = 6 ^{\circ}C$$

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