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math - please help

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Which expression is equal to 1/8000 written in scientific notation?
A.8.0 x 10to the 3rd
B.1.25 x 10–4
C.125 x 10–5
D.1.25 x 10 the the 4th

I think it is A..?

  • math - please help -

    1/8 = .125 = 1.25x10^-1
    but you are dividing by 8000, so the answer is 10^3 as big: 1.25x10^-4. (B)

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