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MinhHoth407 MinhHoth407
  • 23-08-2014
  • Mathematics
Answered

Which answer is closest to the true value of the expression:

(9.1 x 10⁴)(1.1 x10^{-5})(log10^{-13})(1000)

A1.3 
B13000 
C-13000 
D1.3 x 10^{-11}

Can anyone explain this one?

Verified Answer :

Anonymous Anonymous
  • 23-08-2014

\((9.1\times10^4)(1.1\times10^{-5})(log10^{-13})(1000)\\\\=(9.1\times1.1)(10^4\times10^{-5}\times10^3)(-13log10)\\\\=10.01\times10^{4-5+3}(-13)\\\\=-130.13\times10^2\\\\=-13013\approx-13000\\\\Answer:(c).\)

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