45+45+45 = 135
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They are: 25 times 25 = 625 or 312.5 plus 312.5 = 625
It means that it doesn't matter what order the numbers you are adding are in. A plus B is the same as B plus A. Contrast it with subtraction which does not have this quality.
Yes, it is commutative. The result will be the same whatever the order of numbers and the operators are.3 + 4 + 3 + 6 + 4 = 20
The mean of a set of numbers is the average. That is to say, all the numbers added together and divided by the number of the numbers. the answer is 30.5
Since the sum of two rational numbers is rational, the answer will be the same as for the sum of an irrational and a single rational number. It is always irrational.