5 is the correct answer.
To prove it, subtract 5 from 18 - You'll get 13.
5 x 2 + 3 = 13.
Using scientific notation, the power of 10 that should be put on the label is of , hence x = 7.
<h3>What is scientific notation?</h3>
A number in scientific notation is given by:
With the base being .
In this problem, we don't want to increase the base values much. Panama's population can be represented as:
Hence, the power of 10 that should be put on the label is of , hence x = 7.
More can be learned about scientific notation at brainly.com/question/16394306
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