The population of these two cities combined in scientific notation is 11.9 x 
Step-by-step explanation:
1a. Population of NYC is 8.1 x 
1b. Population of LA is 3.8 x 
2.To find total population of the two cities combined,
2a. Add population of NYC and LA
Total population = NYC's population + LA's population
Total population = (8.1 x
) + (3.8 x
)
2b. Take
common
Total population =
* (8.1 + 3.8)
Total population =
* 11.9
Therefore, the population of these two cities combined in scientific notation is 11.9 x 
Keyword: Scientific notation
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