Answered

A phone company offers two monthly plans. Plan A costs $15 plus an additional $0.14 for each minute of calls. Plan B has no initial fee but costs $0.18 for each
minute of calls.

Answer :

reinhard10158

Step-by-step explanation:

x = number of minutes

first cost function :

c(x) = 0.14x + 15

the second cost function :

c(x) = 0.18x

I guess, the question (not written in the description) is after how many minutes call time the first plan breaks even with the second plan and further becomes the better choice ?

0.18x = 0.14x + 15

0.04x = 15

x = 15/0.04 = 375

with 375 minutes calling time per month the first plan costs the same as the second plan.

and starting with 376 minutes per month the first plan becomes the cheaper option.

under 375 minutes per month the second plan is the cheaper option.

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