Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 1 - Whole Numbers - 1.10 Solving Application Problems - 1.10 Exercises: 8

Answer

Estimate: 200 million; Exact: 167 million

Work Step by Step

To estimate, we round each number to the nearest hundred million, so 311 million rounds to 300 million and 478 million rounds to 500 million. We subtract 500 million - 300 million to get an estimated increase of 200 million. The exact difference is 478 million - 311 million = 167 million.
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