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26 January, 12:56

nanette installed a security system in her office for $150. the monthly monitoring fee is $30. so far, nanette has spent $420 for her security system. for how many months has she had the service?

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  1. 26 January, 13:07
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    9 months.

    Step-by-step explanation:

    Well we subtract the one time fee of $150 from $420

    420-150=270

    Now we need to divide $270 by $30, the price she pays every month.

    270:30=9

    She has had the service for 9 months.
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