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Answer :

We can translate this question as follows:

[tex]0.08x+5.95=17.15[/tex]

Then, we need to solve the equation for x (number of minutes):

[tex]0.08x=17.15-5.95\Rightarrow0.08x=11.2\Rightarrow x=\frac{11.2}{0.08}\Rightarrow x=140[/tex]

Therefore, Tiffany talked on the phone for 140 minutes.

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