Choose the property of addition that justifies the equation.
(6 + x) + 8 = 6 + (x + 8)
(choose one)

Associative

Step-by-step explanation:

Associative property is the one that says that when 3 or more numbers are summed, the grouping of such numbers has no effect on the result of the sum. It is:

(a + b) + c = a + (b + c) for every a, b and c real numbers.

18

step-by-step explanation:

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a = 11 : 4

b = 38

c = 1 for every 6