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24 July, 18:55

A phone company charges a flat fee of $100 for one phone installation plus $40 for each additional phone jack. How many phones could be installed flr $420? For this question, you will need to write the equation to model the problem and answer the question.

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  1. 24 July, 21:03
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    The answer is 9 phones.

    First you subtract the initial phone installation with $420.

    420 - 100 = 320

    Now divide: 320/40 = 8

    8 plus the first phone phone eaquals 9.
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