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17 December, 22:45

The relationship between the monthly fee for Brandon's phone and the price per minute for long distance is modeled by the linear function f (x) = 0.05x + 3, where x is the number of minutes used for long distance. What is the total bill if Brandon used 20 minutes of his long distance service in a month?

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  1. 17 December, 23:29
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    If you use 0.05x+3 (x equal to the number of minutes) it would be 0.05 (20) + 3 = 4. Pretty sure this is correct, but you might want to check it.
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