Questions is: the sum of 28+29+42=99. what addition property was used commutative, associative, identity, and distributive ?

Since, it is given that

Now, we have to identify the addition property for the given equation.

Associative property of addition states that for any real numbers say 'a' , 'b' and 'c', a+(b+c) = (a+b)+c

So, in the given question 28+29+42

We can use associative property as

(28+29)+42 = 28+(29+42)

57+42 = 28+71

99 = 99

Hence, among the given properties, associative addition property is used.

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