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 4 - Decimals - 4.4 Multiplying Decimal Numbers - 4.4 Exercises - Page 294: 47

Answer

(a) The area of the bill before 1929 was about 23.2 sq in. The area after 1929 was about 16.0 sq in. (b) The difference in the rounded areas is 7.2 sq in.

Work Step by Step

(a) $7.4218 \times 3.125 \approx 23.2$ $6.14 \times 2.61 \approx 16.0$ (b) $23.2 - 16.0 = 7.2$

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