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There are two cell phone companies that offer different packages. Company A charges a monthly service fee of $35 plus $0.04/min talk-time. Company B charges a monthly service fee of $43 plus $0.03/min talk-time.

The model for Company A can be written as `A =`  

The model for Company B can be written as `B =`  

If the average number of minutes used each month is 778, how much does this cost for each Company?

Company A cost would be $

Company B cost would be $