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17 September, 00:20

Haley pays a monthly fee of $20 for her cell phone and then pays 5 cents per minute used. The cost of Haley's cell phone bill can be expressed by the function C (m) = 0.05m + 20, where m is the number of minutes used. What are the domain and range of the function C (m) ?

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  1. 17 September, 00:36
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    The domain is

    x >=0

    Or simply [0, infinity)

    Since Haley can not use any negative minutes.

    The range is

    y >=20

    Or simply [20, infinity)

    This is because if Haley doesn't use any minutes, the price will stay at $20.

    Let me know if you have any questions.
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