Samuel moved from a city to a small town. The population of the city is 7.2 * 105, which is about 18 times as great as the small town. Which expression could represent the approximate population of the small town?

Given:

The population of the city is 7.2 * 10^5

7.2 x 10 ⁵ in standard from is 720,000

720,000 is 18 times greater than the population in town.

720,000 / 18 = 40,000

The population in the small town is 40,000.

It can be presented in scientific notation as 4 x 10 ⁴.