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26 October, 08:58

3: Keith purchases a cell phone plan, which includes a cell phone and cell phone service. He makes a deposit of $100 for the cell phone and then pays $45 per month for the cell phone service. A. Create an equation to model the total amount of money, y, in dollars, Keith spends on the cell phone and plan after x months. B. How much money does Keith spend per year for cell phone service?

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  1. 26 October, 10:16
    0
    y = 100 + 45x

    $640

    Step-by-step explanation:

    y = 100 + 45x

    One year = 12 months

    y = 100 + 45 (12)

    y = 100 + 540 = 640
  2. 26 October, 12:50
    0
    A. y = 45x + 100

    B. $ 540

    Step-by-step explanation:

    y = 45x + 100

    y = 45 x 12 + 100

    y = 540 + 100

    540 is your answer because it asks for yearly rate not total rate.
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