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) ?

Question

Mathematics

Mohamed Santos

6 January, 15:18

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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Answers (1)

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Keaton Bowers · Answer 1

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.