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Need help with this question also need help understanding it The worldwide number (in millions) of a particular phone sold can be approximated by the

Need help with this question also need help understanding it

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The worldwide number (in millions) of a particular phone sold can be approximated by the function f(x) = - 879 + 401 In x, where x = 11 corresponds to 2011. (a) What was the number of worldwide sales for the particular phone in 2016? (b) If the model continues to be accurate, what was the first full year in which the particular phone sales exceed 265 million? (a) To find the number of worldwide sales in 2016, substitute for x in the function. (Simplify your answer.) The number of worldwide sales for the particular phone in 2016 was approximately million. (Type an integer or decimal rounded to the nearest tenth as needed.) (b) The first full year in which the particular phone sales exceed 265 million is

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