Final answer:
Population growth rate (r) is determined by birth rate (b) and death rate (d). Population change is calculated by considering births, deaths, immigration (i), and emigration (e).
Step-by-step explanation:
Population growth rate (r) is how fast a population changes in size over time. It can be calculated by subtracting the death rate (d) from the birth rate (b). The formula for population growth rate is: r = b - d.
Population change can be calculated by taking into account the birth rate, death rate, immigration (i), and emigration (e). The formula for population change is: population change = births - deaths + (immigration - emigration).
For example, if a population has a birth rate of 20, a death rate of 10, 1000 immigrants, and 500 emigrants, the population growth rate would be 10 (20 - 10) and the population change would be 710 (20 - 10 + (1000 - 500)).