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Math Help - Dieriveing mathamatical modells

  1. #1
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    Dieriveing mathamatical modells

    Ok so I have some questions and not sure if my maths is right, apoligies of this is posted in wrong place. see attachment for diagram of open topped box with dimentions, sorry about poor drawing, units in cm

    1. Dirive a mathematical formula for the surface area of box?

    My answer :
    16 x 48 = 768 x2 = 1,536
    16x 64 = 1,024 x2 = 2,048
    48x64 = 3,072

    add 3 answers = 6,656 cm2 is surface area

    2. if each box is cut from 1m squared piece cardboard, how much wastage is there per unit?
    10,000 - 6,656 = 3,344com

    3. how many boxes can be cut from a ten meter square sheet of cardboard

    10,000 x 10 = 100,000 / 6,656 = 15 boxes

    can anyone confirm this is correct
    Attached Thumbnails Attached Thumbnails Dieriveing mathamatical modells-modelling.jpg  
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Dieriveing mathamatical modells

    1.) and 2.) look good.
    Last edited by MarkFL; January 15th 2013 at 10:41 AM.
    Thanks from ronanbrowne88
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    Re: Dieriveing mathamatical modells

    3/3 words misspelled. It's "Deriving Mathematical Models."

    1) and 2) look correct...alternatively for 1), you can subtract off 4 16cm x 16cm from a large rectangle.

    For 3), is it 10 m^2, or a square of dimension 10 m x 10 m? From a practical standpoint, we can't really wasted pieces of cardboard to make a box; we have to cut out full pieces.
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  4. #4
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    Re: Dieriveing mathamatical modells

    humm i think its 10^2


    10,000 cm is 1m^2
    100,000 cm is 10 m^2

    my next line was

    100,000cm / 6,656cm^2 (surface area of box)

    am i missing a step?
    because the first figure is cm , and second is cm^2 so am i right in thinking i cant divide numbers with different values from each other
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    Re: Dieriveing mathamatical modells

    Thanks sharing your information.Its looking nice.
    Georgetown Mortgage Bank - Austin
    Last edited by wtjohnson12; January 16th 2013 at 05:54 AM.
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  6. #6
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    Re: Dieriveing mathamatical modells

    wtjohnson12, how much do you get paid for forcing advertising onto websites that you do not pay for the advertising?

    ronanbrowne, what you have is an answer but not a "mathematical model". A "mathematical model" would be something like "the total surface area of a rectangular solid with edge lengths a, b, c is 2ab+ 2ac+ 2bc" or, in this particular case, "the area of the large (48+ 32) by (64+ 32) rectangle minus 4 times the area of the 16 by 16 squares that are cut off".
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