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15 January, 22:20

The function f (x) = 0.11 x + 43 relates how much derek pays for phone service, f (x), to the number of minutes, x, used for international calls in a month. what is the value and meaning of f (320) ?

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  1. 15 January, 22:24
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    f (320) = how much Dereck pays for phone service if he calls 320 minutes.

    F (320) = 0.11 (320) + 43=35.2+43=78.2

    Answer: the value of f (320) is $78.2 and it will be the cost of phone service for 320 minutes of international calls.
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