Question 1076017
{{{ y=y[0]*e^kt}}}
{{{kt=ln(y/y[0])}}}
{{{k=ln(y/y[0])/t}}}
So,
{{{k=ln(.66/1.98)/2}}}
{{{k=ln(1/3)/2}}}
{{{k=(1/2)(ln(1)-ln(3))}}}
{{{k=-ln(3)/2}}}