Question 65738
{{{A = A[0]e^(-.058t)}}}
{{{A[0] / 2 = A[0]e^(-.058t)}}}
{{{1/2 = e^(-.058t)}}}
{{{ln(.5) = -.058t}}}
{{{-.693 = -.058t}}}
{{{t = 11.95 }}} or very close to 12 days