
America is getting older. The graph shows thhe projected elderly U.S. population for ages 65–84 and for ages 85 and older.
The formula
a. Use the formula to find the projected increase in the number of Americans ages 65–84, in millions from 2020 to 2050. Express this difference in simplified radical form.
b. Use a calculator and write your answer in part (a) to the nearest tenth. Does this rounded decimal overestimate or underestimate the difference in the projected data shown by the bar graph on the previous page? By how much?

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