In the following, justify each step with a property, definition or an operation.

1. Justify going from (3x + 10x) + 2y

to x(3 + 10) + 2y

We have two different answers: one says it is a result of a distributive operation, and another says it is a result of an associative operation.

which one is correct, distributive or associative?

2. Justify going from x(13) + 2y

to 13x + 2y

Which one is correct, distributive or commutative?

thanks!

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