
Concept explainers
Older. Calmer. As we age, daily stress and worry decrease and happiness increases, according to an analysis of 340,847 U.S. adults, ages 18-85, in the journal Proceedings of the National Academy of Sciences. The graphs show a portion of the research.
a. Find the slope of the line passing through the two points shown by the voice balloons. Express the slope as a decimal.
b. Use your answer from part (a) to complete the statement:
For each year of aging, the percentage of Americans reporting “a lot” of stress decreases by _________ %. The rate of change is _________ % per ___________.

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Chapter 7 Solutions
Thinking Mathematically, Books a la Carte Edition plus MyLab Math with Pearson eText -- Access Card Package, 4/e (7th Edition)
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