Correct
For instance, 2 + 5 + 9 +14 = 7 + 9 + 14 = 16 + 14 = 30
(2 + 5) + (9 + 14) = 7 + 23 = 30
2 + (5 + 9) + 14 = 2 + 14 +14 = 16 + 14 = 30
2 + (5 + (9 + 14)) = 2 + (5 + 23) = 2 + 28 = 30
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Associative
4 5 4 46 65 76 57 finally 67
The way in which numbers are grouped when added or multiplied does not change the sum or product.In symbols the associative property of addition says that (a+b) +c = a + (b +c) where a,b, and c are any numbers.The associative property for multiplication says that (ab)c=a(bc).Informally, the associative property says that grouping does not matter when applying the operation.
14.Sum means a add. a good way remember what sum means, is that sum and add both have three letters :)
When the terms in a polynomial are commutative, they can be grouped with parentheses in any way.