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16 August, 13:07

Isaac shoveled 9 of his neighbors' driveways after a snow storm. He charged $25 for a short driveway and $45 for a long driveway. Which equation can be used to find y, the total amount that Isaac charged when x of the driveways are short?

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  1. 16 August, 15:12
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    y ($) = 405 - 20x

    Step-by-step explanation:

    Number of short driveways = x

    Number of long driveways = 9-x

    Fee per long driveway = $45

    Fee per short driveway = $25

    Total amount = y

    y ($) = 25x + 45 (9-x)

    = 25x + 405 - 45x

    = 405 - 20x
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