SAT Math Multiple Choice Question 213: Answer and Explanation

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Question: 213

3. A country's birth rate is the number of births per year per 1,000 people in the country, and a country's death rate is the number of deaths per year per 1,000 people. Immigration refers to the number of people who move into a country each year, and emigration refers to the number of people who move out of the country each year. A country's population growth is determined by these four variables. Table 1 gives birth, death, immigration, and emigration rates in four countries and lines 1-4 in Figure 1 model the population for the four countries shown over time.

Line 1 represents which country's population?

  • A. East Zealand
  • B. West Zealand
  • C. North Zealand
  • D. South Zealand

Correct Answer: D


D Line 1 shows exponential growth, because the line curves upward. Because birth rate and death rate are per 1,000 people, a birth rate higher than a death rate will result in exponential growth (because births-deaths will increase as the population increases). Immigration and emigration numbers are per year and therefore have a linear effect on the graph (as the absolute change in the population due to immigration-emigration is constant). South Zealand has more births per 1,000 than deaths per 1,000, so (D) accurately reflects line 1.

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