Answer: [tex]3^9[/tex] square miles.
=19683 square miles.
Step-by-step explanation:
We are given that the area of San Bernardino County California, the largest county in the United States, is about three to the power of nine square miles.
i.e. The area of San Bernardino County = [tex]3^9[/tex] square miles.
That can be expressed as [tex]3\times3\times3\times3\times3\times3\times3\times3\times3=19683[/tex]
Hence, the area of San Bernardino County = 19683 square miles.