a rectangle has a perimeter of 22cm and an area of 30 cubic meter. what are its dimensions?

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  1. area is measured in square metres, not cubic metres.
    If that is what you meant ....

    length ---x
    width ---y
    2x + 2y = 22
    x+y = 11 ---> y = 11-x

    xy = 30
    x(11-x) = 30
    11x - x^2 - 30 = 0
    x^2 - 11x + 30 = 0

    solve for x, it factors very nicely.

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