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Math Help - this may as well be chinese to me, so im not sure how to be more descriptive=(

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    this may as well be chinese to me, so im not sure how to be more descriptive=(



    I just began class today.. I have no experience with any of this and the course work does not begin to explain it.. i googled the symbol "|" it tells me that it means "divided into" that tells my feeble mind that x/x=1; and so "1 is equal to or less than -4.25" obviously false... the solution gives me -infinity..... my brain hurts.... what do?
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    ps. i took a screen cap, because i dont even know how to key in those symbols


    pss. i HATE math =(
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    Quote Originally Posted by sloupok View Post
    That set is simply \left(-\infty,\frac{17}{4}\right].

    But I can't imagine that this is what was meant. Was it?

    Could it have been |x|\le\frac{17}{4}~?
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    the first set you have is the correct answer, but i still have no idea what any of it means
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    Quote Originally Posted by sloupok View Post


    I just began class today..
    You're given this on your 1st day...by a teacher who gave no explanation?
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    | means "given that" ...so
    find set of values of x given that | .......x<=17/4
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    Quote Originally Posted by Wilmer View Post
    You're given this on your 1st day...by a teacher who gave no explanation?
    yes exactly.

    i was able to complete every other question on the assignment correctly with average of 97.6; excluding the problem given in OP, the assignment was easily understood
    examples:
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    Quote Originally Posted by MaxJasper View Post
    | means "given that" ...so
    find set of values of x given that | .......x<=17/4

    so "x is less than or equal to -4.25"?

    what does the fraction -17/4 inbetween || mean?
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    |-17/4| means the ABSOLUTE VALUE or SIZE of -17/4. In other words, it's asking you how far away is -17/4 from 0?
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    Re: Prove It

    so the actual charge is irrelevant to the solution?

    just that the value of x is less than or equal to the difference to zero(+/-) of the value of the given?

    so the answer set (-infinity,4.25) -Plato; is a ray from point (4.25,0) towards negative, infinitely along the x axis?
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    No, the absolute value is a DISTANCE. You can only ever have a POSITIVE value for a distance (so it turns all numbers positive). Therefore |-17/4| = 17/4, and the set x <= |-17/4| is the same as x <= 17/4. So in interval notation your answer is (-infinity, 17/4].
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    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(

    thank you all =D
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