Simplify the following quantities.

  $\log_4(64) =$

  $\log_3(81) =$

  $\log \left(\frac{1}{1000}\right) =$

  $\log(0.00001) =$

  $\ln(e^{-6}) =$

  $\log_{17}(17^{-8}) =$

  $\log_{9}(3) =$

  $\log_{73}(1) =$