Mathematics

Mathematics, 15.12.2019 16:31, cduke1919

Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each minute of use?
a) f(x) = 20 + 6x)
b) f(x) = 20.06x
c) f(x) = 20 + 0.06x

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