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9 September, 12:54

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

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  1. 9 September, 14:00
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    9 Months

    Step-by-step explanation:420 - 150 = 270

    270/30 = 9
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