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Math Help - please help with math name property of real numbers

  1. #1
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    please help with math name property of real numbers

    I'm stuck on these please help

    Name the property of real numbers that justifies each statement.

    (2) a) (4 + y) + 12 = (y + 4) + 12 Associative


    (2) b) (y + 4) + 12 = y + (4 + 12) Inverse


    (2) c) where x ≠ 0 Commutitative


    (2) d) Additive


    (2) e) 5(7x + 2) = 5(7x) + 5(2) ?
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  2. #2
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    Quote Originally Posted by fancyface View Post
    I'm stuck on these please help

    Name the property of real numbers that justifies each statement.

    (2) a) (4 + y) + 12 = (y + 4) + 12 Associative
    This is called commutative property,
    4+y=y+4
    (2) b) (y + 4) + 12 = y + (4 + 12) Inverse
    This is called associative property.
    (2) c) where x ≠ 0 Commutitative


    (2) d) Additive
    I think you are missing something.
    (2) e) 5(7x + 2) = 5(7x) + 5(2) ?
    Left-distributive. (But it really does not matter for commutative rings).
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