Working Age The scatter plot below projects the ratio of the working-age population to the...

Working Age The scatter plot below projects the ratio of the working-age population to the elderly.

a. Do the data appear to fit a linear function?

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b. The data points shown in the scatter plot from 2010 to 2030 are projections made from a mathematical model. Do those projections appear to be made with a linear model? Explain.

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c. If the ratio is 3.9 in 2010 and projected to be 2.2 in 2030, what is the average annual rate of change of the data over this period of time?

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d. Write the equation of the line joining these two points.