# Algebra

which number is not written n scientfc notaton? a)15.5 x 10^4 b)2.567x 10^-5 c)6.7 x 10^3 d) none of these

I think D

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1. I think not, a) is written to two digits before the decimal, sci notation has one digit.

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2. Letter A) is not in scientific notation do to the fact that 51. what ever is higher than ten, and to be a valid notation the first number has to be between one and ten, no lower then one and no higher than ten, so letter A) would not be in scientific notation

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