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Math Help - Please help me finish this equation.

  1. #1
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    Please help me finish this equation.

    My teacher wants me to finish the equation and is asking me what y equals? What do I do?

    y = e^3


    lny = ln(e^3)


    lny = 3ln(e)


    lny = 3
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  2. #2
    MHF Contributor Amer's Avatar
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    Quote Originally Posted by bobbyboy1111 View Post
    My teacher wants me to finish the equation and is asking me what y equals? What do I do?

    y = e^3


    lny = ln(e^3)


    lny = 3ln(e)


    lny = 3
    find it by using a calculator and it equal 20.0855369231877
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  3. #3
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    I need to finish showing the work after lny = 3 and don't know how. This stuff is hard and confusing!!
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  4. #4
    MHF Contributor Amer's Avatar
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    Quote Originally Posted by bobbyboy1111 View Post
    I need to finish showing the work after lny = 3 and don't know how. This stuff is hard and confusing!!
    evaluate e^3 just there is no work it is like if I said

    y=3^3

    you will say that y=27 just there is no work
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  5. #5
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    Talking

    If you're supposed to "find what y equals", then copy down "e^3", because this is clearly what y equals.

    If you're supposed to be doing something with the natural log of y, then the instructions can not be to "find what y equals", since you're very clearly going in the opposite direction.

    This is at least the third time you've posted this question. (Others include this and this.) The reason you keep getting the same answer is that "the value of y" was, is, and will remain "e^3", and there was, is, and remains no reason to be mucking about with the natural log, at least not under the conditions you have posed. Posting the exact same information a fourth time will be unlikely to change the answer. Sorry.
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  6. #6
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    Are you allowed to use a calculator to find the value of y? If so,

    1. type in 3
    2. then type the e^x key
    3. then, well, there is no step 3

    Maybe you're supposed to be using log tables instead of a calculator, in that case you'd want to find the anti- log_e of e^3 to find y. Or a sliderule?

    But you seem to be confused as to what exactly is the problem you are trying to solve.
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  7. #7
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    Quote Originally Posted by stapel View Post
    If you're supposed to "find what y equals", then copy down "e^3", because this is clearly what y equals.

    If you're supposed to be doing something with the natural log of y, then the instructions can not be to "find what y equals", since you're very clearly going in the opposite direction.

    This is at least the third time you've posted this question. (Others include this and this.) The reason you keep getting the same answer is that "the value of y" was, is, and will remain "e^3", and there was, is, and remains no reason to be mucking about with the natural log, at least not under the conditions you have posed. Posting the exact same information a fourth time will be unlikely to change the answer. Sorry.
    Thankyou.

    Thread closed.
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