The number of cell phone subscribers in a certain country has steadily increased since 1985. A model that approximates the growth of cell phone subscribers is given by
where
S is in millions of people and
x is the number of years since 1985. Use this model to approximate during which year the number of cell phone subscribers will exceed
million for the first time. Hint: You might want to use a calculator for the arithmetic in this problem, but by judicious rounding of the coefficients, you could get an approximate answer that would give you the proper result.