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. StepWorkReasoning
−7.9 + 8.2 − 3.4 + 2.1Original problem
1−7.9 + 8.2 + (−3.4) + 2.1Additive inverse
2−7.9 + (−3.4) + 8.2 + 2.1Associative property
3(−7.9 + (−3.4)) + (8.2 + 2.1)Commutative property
4−11.3 + 10.3Simplify
5−1Simplify