To find the population of Lewisburg after 5 years, we need to calculate the decrease in population each year and subtract it from the initial population.
Given:
Initial population of Lewisburg = 10,820
Decrease in population each year = 420
To find the population after 5 years, we can subtract the total decrease in population from the initial population.
Total decrease in population after 5 years = Decrease per year × Number of years
= 420 × 5
= 2,100
Population after 5 years = Initial population - Total decrease in population
= 10,820 - 2,100
= 8,720
Therefore, the population of Lewisburg after 5 years would be 8,720.