Question 881789
{{{ A(t) = 457*e^(-.019t) }}}
Find {{{ A(78) }}}
{{{ A(78) = 457*e^(-.019*78) }}}
{{{ A(78) = 457*e^(-1.482) }}}
{{{ A(78) = 457*.22718 }}}
{{{ A(78) = 103.82 }}}
103.82 mg are left after 78 years