During the last twenty years, which category of the U.S. population has experienced the largest gains in average income?
a. The lowest-paid 20 percent
b. The middle 20 percent
c. The highest-paid 20 percent
d. All income categories have experienced about the same level of upward social mobility.
Question 2
During the last three decades, the real income of African American families in the United States has ________
a. gone down a lot.
b. kept pace with the gains made by white people.
c. gone up a lot.
d. changed very little.
Population Interactions and Communities
Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his
Population Losses in the South, 1920–1930
Write the equation for the population y at any instant
Distribution of the World’s Population
The population of a city has continued to grow since 1950.