Answer
283.8 million cellular subscriptions
Work Step by Step
$f(x)=17*x^{16/15}$
year is 2009
$2009-1995=14$
$f(x)=17*x^{16/15}$
$f(14)=17*14^{16/15}$
$f(14)=17*16.693$
$f(14)=283.78$
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