Question 315786
{{{     log (x,0.05) = -1/2 }}}
{{{     0.05 = x^(-1/2) }}}
{{{     0.05 = 1/x^(1/2) }}}
{{{     0.05 = 1/sqrt(x) }}}
{{{     0.05sqrt(x) = 1 }}}
{{{     sqrt(x) = 1/0.05 }}}
{{{     x = (1/0.05)^2 }}}
{{{     x = (20)^2 }}}
{{{     x = 400 }}}