richard wishes to make a long-distance call the charges are $.75 for the first three minutes and 14 cents for?

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richard wishes to make a long-distance call the charges are $.75 for the first three minutes and 14 cents for each additional minute if richard has $2.15 how many minutes can his call last

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  • 8 years ago
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    Let x = the number of minutes he can call for. Since it costs 0.75 for the first 3 minutes, it means the 0.14 per minute only applies to minutes AFTER the first 3, so the cost looks like this:

    0.75 + 0.14(x - 3)

    Since he has 2.15, we set them equal:

    0.75 + 0.14(x - 3) = 2.15

    Now, solve. First subtract 0.75:

    0.14(x - 3) = 1.40

    Now, divide by 0.14:

    x - 3 = 10

    Add 3, and we're done:

    x = 13, meaning Richard can make a 13 minute phone call.

    Source(s): BA in Mathematics
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