Mathematics, 09.11.2020 20:50, glocurlsprinces
Andrew is showing his work in simplifying β4.5 + 4.2 + 5.6 β 7.3. Identify any errors in his work or in his reasoning.
Step Work Reasoning
β4.5 + 4.2 + 5.6 β 7.3 Original problem
1 β4.5 + 4.2 + 5.6 + (β7.3) Additive inverse
2 β4.5 + (β7.3) + 4.2 + 5.6 Commutative property
3 [β4.5 + (β7.3)] + (4.2 + 5.6) Associative property
4 β11.8 + 9.8 Simplify
5 β21.6 Simplify
Step 1: He wrote β7.3 incorrectly as + (β7.3).
Step 2: He identified changing the order of the numbers as the commutative property, which is incorrect.
Step 3: He identified changing the grouping of the numbers as the associative property, which is incorrect.
Step 5: He simplified incorrectly.
Answers: 2
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