Question 1126133
Half-life of 28 years given



{{{1*e^(rt)=1/2}}}

{{{e^(rt)=1/2}}}

{{{ln(e^(rt))=ln(1/2)}}}

{{{r*t=ln(1/2)}}}


Your already know that for this, t=28.

{{{r=ln(1/2)/28}}}



You should be able to use this for answering the question and using the equation in your given instructions.