don't know where to start or end! charges $20 for a phone and $30/month for its economy plan. The equation C =30t + 20 describes the total cost, C of operating a media service phone for t months.

The total cost for 10 months of service is $_______.?
If a customer has only 80 available, how many month of service can he receive.

I came up with $180 and 10 months of service for $80

30x10+20=320

4months

To find the total cost for 10 months of service, we can use the given equation C = 30t + 20, where C represents the total cost and t represents the number of months of service.

Substituting t = 10 into the equation, we have:
C = 30(10) + 20
C = 300 + 20
C = 320

So, the total cost for 10 months of service is $320.

Now, let's find out how many months of service a customer can receive if they have only $80 available.

We can rearrange the equation C = 30t + 20 to solve for t:
C - 20 = 30t
30t = C - 20
t = (C - 20) / 30

Substituting C = 80 into the equation, we have:
t = (80 - 20) / 30
t = 60 / 30
t = 2

So, if a customer has only $80 available, they can receive 2 months of service.