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2 November, 19:09

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. 2 November, 19:32
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    domain: 0 ≤ m ≤ 44,640

    range: 20 ≤ C ≤ 2252

    Step-by-step explanation:

    Haley cannot possibly use her phone more than 24 hours a day for 31 days in a month, so the number of minutes in a month puts a limit on the domain of the function.

    The upper end of the range is correspondingly limited.

    The number of minutes cannot be negative, and C will have a minimum value of 20.
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