Answer:
[tex]AT \alpha T() = R_{f} \: + \: M_{f}[/tex]
[tex]Verizon() = R_{f} \: + \: M_{f}[/tex]
[tex]R_{f} =one \: time \: registration \: fee \: \\ M_{f} = monthly \: fee[/tex]
Step-by-step explanation:
AT&T charge fee = $15.00 + $35.00
Verizon charge fee = $25.00 + $75.00
then the function for AT&T is:
[tex]AT \alpha T() = R_{f}(15) \: + M_{f}(35)[/tex]
and the function for Verizon is:
[tex]Verizon() = R_{f}(25) \: + M_{f}(75)[/tex]
where:
[tex]R_{f} =one \: time \: registration \: fee \: \\ M_{f} = monthly \: fee[/tex]