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Mathematics 20 Online
OpenStudy (anonymous):

over the last several years there has been an increase in the amount of school age students carrying cellphones. Current estimates are that there are 1,237,000 students in the US with cell phones. The trends is likely to continue, with the amount of children with phones tripling every 10 years. At that rate how many students will have cellphones in 2015, 2100, and in two years

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