Results 1 to 4 of 4

Math Help - calculus/economic maths. need help

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    Perth Australia
    Posts
    1

    calculus/economic maths. need help

    struggling with some maths problems for study.
    http://i.imgur.com/6HuOG.jpg
    Last edited by turnernp; September 16th 2012 at 11:50 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: calculus/economic maths. need help

    I find some of the exponents too small for these old eyes to make out clearly...

    Nevertheless, where are you stuck? Can you post what you have tried, or what your thoughts are on how to begin?
    Last edited by MarkFL; September 17th 2012 at 12:28 AM.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Aug 2012
    From
    Manila, Philippines
    Posts
    24
    Thanks
    1

    Re: calculus/economic maths. need help

    seriously?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Apr 2005
    Posts
    16,217
    Thanks
    1789

    Re: calculus/economic maths. need help

    The problems are:
    5) Differentiate
    a) f(x)= \frac{4}{x- 2}

    Looks like a simple application of the "quotient rule". Or, perhaps easier, write it as f(x)= 4(x- 2)^{-1} and use the "chain rule".

    b) y= 40x ln(x^{2x+5})

    Using the fact that ln(a^b)= bln(a) would simplify that a lot. Then just use the "product rule".

    c) V(t)= 10000e^{0.65x}
    Surely you know how to differentiate e^x? And, of course a very basic application of the "chain rule".

    8)
    a) Find the integrals of these functions
    i) f(x)= 9x^2+ x- 5
    Do you know that the integral of x^n is [tex]\frac{x^{n+1}}{n+1}[tex]?

    ii) f(x)= 3e^x- 4x^2
    Do you know the itegral of e^x?

    b) Find definite integral (i.e. area under the curve) of the above function for 1\le x\le 5 (i.e when x falls betweeen 1 and 5, inclusive).
    Once you have done (a) this should be easy.

    (For future reference, not making any attempt on these problems yourself, or even trying to type them in yourself, makes a very bad impression.)
    Last edited by HallsofIvy; September 17th 2012 at 08:02 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Calculus in Economic
    Posted in the Calculus Forum
    Replies: 1
    Last Post: December 16th 2010, 03:56 AM
  2. Economic Order Quantity
    Posted in the Statistics Forum
    Replies: 11
    Last Post: March 23rd 2010, 08:22 PM
  3. Economic Development - Inequality
    Posted in the Business Math Forum
    Replies: 0
    Last Post: October 3rd 2009, 01:46 PM
  4. Economic lot size
    Posted in the Business Math Forum
    Replies: 0
    Last Post: April 25th 2008, 10:43 AM
  5. Economic question
    Posted in the Business Math Forum
    Replies: 1
    Last Post: January 18th 2008, 09:55 AM

Search Tags


/mathhelpforum @mathhelpforum