Answer:
Domain = \(\{x|x\geq 0\}\)
Range = \(\{y|y\geq 20\}\)
Step-by-step explanation:
We are given,
The cost of the phone bill is represented by the function,
\(C(m) =0.05m+20\), where m = number of minutes used.
Now, as 'm' is the number of minutes used. So, they cannot be negative.
Thus, the domain of the function is \(\{x|x\geq 0\}\).
Further, when m= 0, then \(C(0) =0.05\times 0+20\) i.e. C(0)= 20.
Thus, the range of the function is \(\{y|y\geq 20\}\).
