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23 September, 07:50

He electrician charges $70 per hour plus a $35 service fee. The total cost, c, for t hours of work is given by the equation c = 70t + 35. If the total cost of the electrician's last job was $245, for how many hours did he work?

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  1. 23 September, 08:00
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    3 hours

    Step-by-step explanation:

    Since the service fee was $35, you can take that out of the total.

    Now you are left with 210.

    210 / 70 = 3
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