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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?

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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?
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The 20 is dollars
Change 6 cents to 0.06 dollars
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Let "x" be # of minutes of use.
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Equation:

Cost = 20 + 0.06x dollars
Cost = 20.06x dollars

Answer:

[tex]y=0.06x+20[/tex]

Step-by-step explanation:

Choices are not given.

However, we can deduct a function which represents this situation.

Notice that there's a constant charge of $20, and 6 cents per minute. Let's call [tex]x[/tex] minutes and [tex]y[/tex] the total money spent. The expression would be

[tex]y=0.06x+20[/tex]

Remember that 6 cents are expressed as 0.06, and the constant term 20 represents $20 of constant charge.

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