\"\"

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The expression is \"\".

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Simplify the expression.

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\"\"      (Original expression)

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\"\"       (Distributive property: \"\")

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\"\"       (Commutative property of addition: \"\")

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\"\"       (Distributive property: \"\")

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\"\"                          (Substitute: \"\" and \"\")

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Therefore, the value of expression is \"\".

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Here, Luna did not distribute the negative sign to the second term and Sophia switched the \"\" and \"\" terms because usually a comes first.

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\"\"

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No;Luna did not distribute the negative sign to the second term and Sophia switched the \"\" and \"\" terms because usually a comes first.

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The correct answer is \"\".