In 1985 the population density of a country was 55 people per square mile, and in 2000 it was 79 people per square mile. use a linear function to estimate when the population density reached 90 people per square mile.

The poll report includes a table titled, “americans using cash now versus five years ago, by age.” the age intervals are not equal. why do you think the gallup organization chose the age intervals of 23–34, 35–54, and 55+ to display these results?