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Thread: 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 $\displaystyle \int_{- \sqrt{3}}^{\sqrt{3}} \left( 3 - x^2 \right)~dx = 2 \int_0^{\sqrt{3}} \left( 3 - x^2 \right)~dx$

    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 $\displaystyle f(x) = (2 - x)^{-1/2}$ 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:

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

    rewrite:

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

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

    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 $\displaystyle f(x)$ on a closed interval $\displaystyle [a,b]$ is given by:

    $\displaystyle \mbox{Average Value} = \frac 1{b - a} \int_a^b f(x)~dx$
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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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