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Mathematics 12 Online
OpenStudy (anonymous):

If phone use is given by the function f(x0=0.485x^2-1.69x+0.315, where the output is in the millions of users. In this formulax=6 corresponds to 1996,x=7 corresponds to 1997, and so on until x=20 corresponds to 2010. Estimate when the number of phone users in the country reached 98 million.

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