If log _{10} 7 = 0.8451,then the position of | vedclass

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(B) Let $x = 7^{-20}$.Taking $\log_{10}$ on both sides:$\log_{10} x = \log_{10} (7^{-20})$$\log_{10} x = -20 	imes \log_{10} 7$$\log_{10} x = -20 	i

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$17$

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(B) Let $x = 7^{-20}$.Taking $\log_{10}$ on both sides:$\log_{10} x = \log_{10} (7^{-20})$$\log_{10} x = -20 	imes \log_{10} 7$$\log_{10} x = -20 	imes 0.8451 = -16.902$.To express this in standard form,we write:$\log_{10} x = -16.902 = -17 + 0.098 = \overline{17}.098$.Since the characteristic is $-17$,the first significant figure of $7^{-20}$ occurs at the $17^{th}$ decimal place.

If $\log _{10} 7 = 0.8451$,then the position of the first significant figure of $7^{-20}$ is

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