Mathematics, 01.11.2019 04:31, hardyca

Mary simplified an expression and got 12.9x10^4 for her answer in scientific notation. her friend, angela, is telling her that her answer is incorrect. why is angela telling her she is incorrect? what is the correct way to write that number in scientific notation?

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Mary simplified an expression and got 12.9x10^4 for her answer in scientific notation. her friend, a...