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.

original problem
−7.9 + 8.2 − 3.4 + 2.1

step work reasoning

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