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Math Help - hello all,can any help me in this questions..

  1. #1
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    Arrow hello all,can any help me in this questions..

    hi friends,
    plz i send in attachements a file contians questions need for sullotion plz help me i have test tommorow.

    thnks.
    Attached Files Attached Files
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by eman.kh View Post
    hi friends,
    plz i send in attachements a file contians questions need for sullotion plz help me i have test tommorow.

    thnks.
    well, if you need this stuff for a test tomorrow, it would be more beneficial to you to tell us what you have tried and allow us to help you work through it.

    for question one, you want \int_{- \sqrt{3}}^{\sqrt{3}} \left( 3 - x^2 \right)~dx = 2 \int_0^{\sqrt{3}} \left( 3 - x^2 \right)~dx

    do you know why? do you see why i have those limits?

    what have you tried for the others?
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    for question 5, use the quotient rule.

    personally, i would rewrite as f(x) = (2 - x)^{-1/2} and use the chain rule twice. then plug in x = 1
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    for question 6, you have:

    \frac {dx}{dy} - e^{y - x} = 0 with x(1) = 0

    rewrite:

    \frac {dx}{dy} = e^{y - x} = e^y \cdot e^{-x}

    \Rightarrow e^x ~dx = e^y~dy

    now integrate both sides and continue
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    provided all the necessary conditions are fulfilled, the average value of a function f(x) on a closed interval [a,b] is given by:

    \mbox{Average Value} = \frac 1{b - a} \int_a^b f(x)~dx
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    for question 10, a function is concave up on the interval its second derivative is positive
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  7. #7
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    1st thnkx alot for helping me really.
    2nd i tried to answer this in papers and i don't have time to write in the forums that's why i put just the questions,and i alrready used the rules u told me really but at final i didn't find the answer.
    so if u want can u comlete yr help with tel me the right answer 4 qustions.

    thnks agian.
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