Question

Help please!
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)?

link to picture of graph:
http://media.education2020.com/evresources/3111-11-08/mc020-1.jpg

Answer 1

Is it possible for m to be negative?

Answer 2

I think so

Answer 3

m is the number of minutes used

Answer 4

can you have a negative amount of minutes used?

Answer 5

no

Answer 6

so m can't be negative

Answer 7

meaning that \[\Large m \ge 0\]

Answer 8

so that forms your domain

Answer 9

the domain is basically the set of restrictions of what values are plugged into the function

Answer 10

so would the range be c≥20?

Answer 11

very good

Answer 12

c = 20 is the smallest the cost gets

Answer 13

thankyou!

Answer 14

you're welcome