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Math Help - i swear i'm right but teacher's arguing with me, please help a wounded student )':

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    Unhappy i swear i'm right but teacher's arguing with me, please help a wounded student )':

    (a) At a small clothing company, the estimated cost function for producing a new line of jeans is C(x)=(x^2-7x+30)/x, where is the number of pairs of jeans produced, in thousands. is measured in dollars.
    i) Calculate the cost of a pair of jeans at a production level of 3000 pairs.
    ii) Determine the rate at which the cost is changing at a production level of 3000 pairs of jeans using any method. Show all work.

    I got approx. $0.99 for the first one, and 1 for the second. She won't help me or give me the solution and i have a test in 2 periods! D: HELP?
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    I can't see what your cost function is...
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    i'm sorry! i guess it wouldn't let me submit the division bar i have on my word document! I edited it now, please help again
    Last edited by jenny85; September 29th 2012 at 02:54 AM.
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    For part i) you need to evaluate C(3), since x represents the number of thousands of pairs of jeans.

    For part ii) you need to evaluate C'(3), since C'(x) represents the rate of change of the cost for x-thousand pairs of jeans.
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    OH oh my goodness how could i not realize that... i think once i copied it down on paper i left out the important details and just focused on the function. thank you so much :')

    so i) is $2
    and ii) is -1.56?
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    Quote Originally Posted by jenny85 View Post
    OH oh my goodness how could i not realize that... i think once i copied it down on paper i left out the important details and just focused on the function. thank you so much :')

    so i) is $2
    and ii) is -1.56?
    I don't think [3^2 - 7(3) + 30]/3 is 2...
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    Re: i swear i'm right but teacher's arguing with me, please help a wounded student )'

    Fundamental rule- your teacher is NOT arguing with you- you are arguing with your teacher!
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