SOLUTION: a phone company charges a flat fee of $100 for one phone installation plus $40 for each additional phone jack. how many iphone could be installed for $420?

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Question 1021577: a phone company charges a flat fee of $100 for one phone installation plus $40 for each additional phone jack. how many iphone could be installed for $420?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
An Iphone doesn't need a jack so I'll assume you mean a landline phone.
420=100%2B40%2AN
320=40N
N=320%2F40
N=8
8 jacks can be installed.