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Math Help - Elementary Matrices

  1. #1
    Senior Member DivideBy0's Avatar
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    Elementary Matrices

    If the sales matrices for January and March (with twice as many cars of each model sold in February as January) had been
    .[1 0 0], and [2 1 0]
    .[4 2 3]........[6 1 4] respectively, find the sales matrix for the first quarter of the year.

    I figured that the quarter year sales would be 2*January + March = [4 .1.. 0]
    .................................................. .........................................[14 5 10]

    However, the answers give the answer [5 ..1 ..0]
    .................................................. ...[18 7 13], why is this?
    Last edited by DivideBy0; April 13th 2007 at 08:26 AM.
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  2. #2
    Super Member

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    Lexington, MA (USA)
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    Hello, DivideBy0!

    You misread that February phrase . . .


    If the sales matrices for January and March (with twice as many cars
    of each model sold in February as January) had been:
    .[1 0 0], and [2 1 0]
    .[4 2 3]........[6 1 4] respectively, find the sales matrix for the first quarter of the year.

    The total is: .[Jan] + 2[Jan] + [Mar]
    Code:
       Jan      Feb       Mar
    |1 0 0|   |2 0 0|   |2 1 0|
    |     | + |     | + |     |
    |4 2 3|   |8 4 6|   |6 1 4|
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