Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.2 The Integers; Order of Operations - Exercise Set 5.2: 121

Answer

Taking 81 mg of aspirin per day and eating red meat more than twice a week will neither stretch nor shrink one's life span.

Work Step by Step

Eating red meat more than twice a week shrinks one's life span by 5 years. The number represents this is $-5$. Taking 81 mg of aspirin per day stretches one's life span by 5 years. The number that represents this is $5$. The final effect on one's life span in doing the two can be found by adding the two numbers together: Effect on one's life span $=-5 + 5 = 0$ Thus, taking 81 mg of aspirin per day and eating red meat more than twice a week will neither stretch nor shrink one's life span.
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