Question 158134
log(1.8*10^-5)=-4.7...
-log(1.8*10^-5)=4.7...
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-4.7=log(1.8*10^-5)
10^-4.7=10^log(1.8*10^-5)
0.0000199526...=1.8*10-5 This is not exactly correct but you get the idea.
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Ed