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Mathematics 18 Online
OpenStudy (anonymous):

In a recent year, the population of California was about 2.52 x 107 people. Its land area is about 4.05 x 105 km2. What was the average number of people per square kilometer?

OpenStudy (anonymous):

0.62 x 105 6.2 x 101 0.62 x 1014 6.2 x 109

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