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19 June, 02:11

Cell phone company A charges $20 per month plus $0.05 per text message. Cell phone company B charges $10 per month plus $0.07 per text message. Is there any number of text messages that will result in the exact same charge from both companies?

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  1. 19 June, 03:15
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    1) Make them into equations.

    0.05x + 20 = 0

    0.07x + 10 = 0

    2) Equate the two.

    0.05x + 20 = 0.07x + 10

    0.02x = 10

    x = 500
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Home » Mathematics » Cell phone company A charges $20 per month plus $0.05 per text message. Cell phone company B charges $10 per month plus $0.07 per text message. Is there any number of text messages that will result in the exact same charge from both companies?
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