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 fee

Question

3 years ago

15

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 fee

dback to Arlene explaining the mistake she made and how to correct her work.
the way she did it was

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

Mathematics

2 answers:

kodGreya [7K] · Answer 1 · 2022-08-27T12:00:44+03:00

kodGreya [7K]3 years ago

7 0

The answer is correct but i do not know what ARLENE did wrong

Ivanshal [37] · Answer 2 · 2022-08-27T14:18:03+03:00

Ivanshal [37]3 years ago

7 0

She wrote +(-3.4) wrong