Answer: A
Step-by-step explanation:
Let's fact check all the answer choices:
A. He used the commutative property
Well, the commutative property states that you can put the equation in any order and the result doesn't change. In step1, andrew makes the equation -5.7+2.2 into 2.2-5.7. Both of these equations equal -3.5, so yes, he used the commutative property.
B.He used the distributive property.
We know this is wrong because the distributive property involves multiplication. An Example of an equation that involves the distributive property is 3(2+1), or 3x(2+1).
C. He used the associative property.
This is wrong because the associative property involves grouping the equation into different parentheses , which doesn't happen.
D. The answer is incorrect
Using a calculator , we know this is wrong.
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