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12 August, 02:52

how many times is each basic property of associative commutative and distributive used to evaluate the expression 23 + 5x + 7y - x - 5 - 27 respectively

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  1. 12 August, 06:23
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    This is a goofy question, because the method of counting is not very well defined.

    23 + 5x + 7y - x - 5 - 27

    Let's make everything an addition because addition is associative but subtraction isn't.

    = 23 + 5x + 7y + - x + - 5 + - 27

    OK, let's commute a few things

    = 5x + 7y + - x + - 5 + - 27 + 23

    = 5x + - x + 7y + - 5 + - 27 + 23

    That's two commutations.

    = (5x + - x) + 7y + ((-5 + - 27) + 23)

    I'll count that as three associations

    = (5 + - 1) x + 7y + - 9

    That's a distributive law (in reverse which is fine)

    = 4x + 7y - 9

    Tallying that's associative law 3 times, commutative law 2 times, distributive law 1 time.
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