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Answer:
[tex]+18000[/tex]
Step-by-step explanation:
Given
Increment = 18000
Required
Represent as a signed number
If the initial population is x.
The new population (y) will be:
[tex]y = x + 18000[/tex]
It is "+" because the population of the city increases.
Hence, the signed number is [tex]+18000[/tex]