Mathematics, 11.02.2020 22:53 jadahilbun01
Angie is showing her work in simplifying β7.9 + 8.2 β 3.4 + 2.1. Identify any errors in her work or in her reasoning.
Step Work Reasoning
β7.9 + 8.2 β 3.4 + 2.1 Original problem
1 β7.9 + 8.2 + (β3.4) + 2.1 Additive inverse
2 β7.9 + (β3.4) + 8.2 + 2.1 Commutative property
3 [β7.9 + (β3.4)] + (8.2 + 2.1) Associative property
4 β11.3 + 10.3 Simplify
5 β1 Simplify
She did not make any errors.
Step 1: She wrote β3.4 incorrectly as + (β3.4).
Step 2: She identified changing the order of the numbers as the commutative property, which is incorrect.
Step 3: She identified changing the grouping of the numbers as the associative property, which is incorrect.
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