As people age, daily stress and worry decrease and happiness increases, according to an analysis of 340,847 adults ages 18 to 85 in a certain country. The graphs show a portion of the research. Complete parts (a) and (b) below. 60- 50- * 60- 2 50- 5 40- E 30- 40- 30- 22.35) 20- 76223) C 20- 10- 0- 15 30 45 60 75 10- Age 0- 22 62 Age a. Find the slope of the line passing through the two points shown in the line graph. Express the slope as a decimal. (Round to one decimal place as needed.) b. Use the 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 Percentage Reporting Stress Percentage R ep orting Stress

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