Results 1 to 2 of 2

Math Help - Simplifying and volume calculating

  1. #1
    Senior Member Mukilab's Avatar
    Joined
    Nov 2009
    Posts
    468

    Simplifying and volume calculating

    Simplify \frac{27x}{3xy^2} I got 9 somehow....

    Simplify \frac{x-5}{x^2-25} I'm just stuck on how to deal with the numbers (-5 and -25)

    Simplify (\sqrt{5}-\sqrt{3})(\sqrt{5}+\sqrt{3}) I got 2

    Total surface area of cylinder X is 25cm^2
    Total surface area of cylinder Y is 225cm^2
    Height of cylinder X is 5cm
    Calculate height of cylinder Y

    Volume of Cylinder X is 27cm^3
    Calculate volume of Cylinder Y


    Again... I have no idea for the method of this volume and height calculating.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Jun 2009
    Posts
    61
    1) \frac{9}{y^2}

    2) \frac{x-5}{x^2-25} = \frac{x-5}{(x-5)(x+5)}
         = \frac{1}{x+5}

    3) (\sqrt{5}-\sqrt{3})(\sqrt{5}+\sqrt{3}) your answer is correct
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Calculating the Volume of a Solid of Revolution
    Posted in the Calculus Forum
    Replies: 2
    Last Post: July 11th 2010, 04:38 PM
  2. Calculating the Volume of a Rotation.
    Posted in the Calculus Forum
    Replies: 1
    Last Post: January 12th 2010, 11:30 AM
  3. Need help in calculating the volume of a cone
    Posted in the Geometry Forum
    Replies: 2
    Last Post: October 23rd 2009, 04:26 AM
  4. Calculating the volume of a spherical cap.
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: February 27th 2008, 03:33 PM
  5. Calculating volume using buoyancy
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: October 31st 2007, 04:01 AM

Search Tags


/mathhelpforum @mathhelpforum