Results 1 to 3 of 3

Math Help - please help very urgent

  1. #1
    Member
    Joined
    Sep 2005
    Posts
    136

    please help very urgent

    A box manufacturer is to make a closed box of volume 288 in3, where the base is a rectangle whose length is three times its width. What is the length of the box that uses the least amount of material?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Jan 2006
    Posts
    56
    if you make a drawing of your box (a cross + a top)
    and if you call h the hight (in inch)
    ----------------w the width
    ----------------3*w the length

    the surface of the matérial you are using (wich you have to minimized) is
    S=2*( (w*3w)+(w*h)+(3*w*h))
    and you have got to get h*w*(3*w)=288 inch^3

    that may give you a clue!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2005
    Posts
    136
    thanks a lot ....
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Urgent!!!help with attempted questions - urgent
    Posted in the Statistics Forum
    Replies: 2
    Last Post: February 28th 2010, 01:29 AM
  2. I need urgent urgent hel with this parabola question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 14th 2008, 05:48 PM
  3. Very urgent!
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 30th 2008, 02:01 PM
  4. Urgent HW help
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: March 14th 2008, 06:52 AM
  5. urgent HELP
    Posted in the Statistics Forum
    Replies: 1
    Last Post: July 12th 2007, 05:34 AM

Search Tags


/mathhelpforum @mathhelpforum