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    Chrysti's Avatar
    Chrysti Posts: 2, Reputation: 1
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    #1

    Aug 11, 2009, 02:16 PM
    algebra 2
    use this model to determine in how many years(to two decimal places) it will take for the percent of spam to reach 95% provided that law enforcement regarding spammers does not change.


    model is P=13+45ln x (x=number of years after 2000)


    "show all work please"
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
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    #2

    Aug 11, 2009, 02:21 PM
    Set your 13 + 45 Ln x = 95 and solve for x. A scientific or graphing calculator will be helpful.
    Chrysti's Avatar
    Chrysti Posts: 2, Reputation: 1
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    #3

    Aug 11, 2009, 02:33 PM

    I'm not too sure how to get the answer can you help me?
    ArcSine's Avatar
    ArcSine Posts: 969, Reputation: 106
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    #4

    Aug 11, 2009, 03:27 PM
    A couple of hints:

    Start by isolating "ln x" on one side of the equation.

    Then use the fact that if

    a = ln x

    then
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