Question

The telephone company offers two billing plans for local calls. Plan 1 charges ​$38 per month for unlimited calls and Plan 2 charges ​$18 per month plus ​$0.04 per call.

Answer 1

The question is incomplete:

The telephone company offers two billing plans for local calls. Plan 1 charges ​$38 per month for unlimited calls and Plan 2 charges ​$18 per month plus ​$0.04 per call.

Use an inequality to find the number of monthly calls for which plan 1 is more economical than plan 2.

Answer:

Plan 1 is more economical than plan 2 when you make more than 500 monthly calls.

Step-by-step explanation:

Plan 1 costs $38 per month for unlimited calls and plan 2 costs $18 per month plus ​$0.04 per call which is: 18+0.04x and you can infer that plan 1 would be cheaper when you have to pay more than $38 using plan 2 and you can express it with the inequality:

18+0.04x>38, where x is the amount of monthly calls

Now, you can solve for x:

0.04x>20

x>20/0.04

x>500

According to this, plan 1 is more economical than plan 2 when you make more than 500 monthly calls.