Mathematics, 10.09.2019 01:10, smkw04p3ao0n

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arlene is showing her work in simplifying −7.9 + 8.2 − 3.4 + 2.1. identify any errors in her work or in her reasoning. write feedback to arlene explaining the mistake she made and how to correct her work. step work reasoning
−7.9 + 8.2 − 3.4 + 2.1 original problem
1 −7.9 + 8.2 + (−3.4) + 2.1 additive inverse
2 −7.9 + (−3.4) + 8.2 + 2.1 associative property
3 (−7.9 + (−3.4)) + (8.2 + 2.1) commutative property
4 −11.3 + 10.3 simplify 5 −1 simplify

Answers: 2

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arlene is showing her work in simplifying −7.9 + 8.2 − 3.4 + 2.1...