Question

log 0,000 000 001 ???

Answer 1

$\mathrm{\ell og\,}(0,000\,000\,001)\\ \\ =\mathrm{\ell og\,}(10^{-9})\\ \\ =(-9)\cdot \mathrm{\ell og\,}10\\ \\ =(-9)\cdot 1\\ \\ =-9$