##### Radioactive substances decay over time. A certain radioactive substance has a half-life of 4 days, i.e. after 4 days only half of the original amount of substance is present. Use the

Radioactive substances decay over time. A certain radioactive substance has a half-life of 4 days, i.e. after 4 days only half of the original amount of substance is present. Use the following formula; f(t)=b*a^t, 1/2*b=b*a^t I already have the following; Growth factor, a=0.841...