Rita is adding 3 + (-8) + 1. She rewrites the expression as 3 + (-1) + 8. What is Rita's error?
She used the commutative property, which cannot be used with negative numbers.
In the new expression, - 8 and 1 should both be negative.
She used the associative property which should only be used with positive numbers ...
She switched the negative signs for - 8 and 1.
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