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Read the Math Notes box above and for Lesson 2.1.2. Then examine the work below that shows one way to simplify the expression 3x + 8 + (x + 10). Decide which property was used for each step. Homework Help ✎

Choose from among the properties below:

When adding three or more numbers or terms together, grouping is not important.

Adding zero to any expression gives the same expression.

Commutative Property of Addition: When adding two or more numbers or terms together, order is not important.