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.
-7.9 + 8.2 - 3.4 + 2.1
(Original problem)
-7.9 + 8.2 + (-3.4) + 2.1
(Additive inverse)
-7.9 + (-3.4) + 8.2 + 2.1
(Associative property)
(-7.9 + (-3.4)) + (8.2 + 2.1) (Commutative property)
-11.3 + 10.3 (Simplify)
-1 (Simplify)
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