Numerical:
A radioactive source has a half-life of 2 hours. If the mass starts at 40mg, what will the mass be after 4 hours?
![decay rates 2](https://www.tutormyself.com/wp-content/uploads/decay-rates-2.png)
Graphical:
Several different times for the half-life can be calculated and averaged.
![decay rates graph 2](https://www.tutormyself.com/wp-content/uploads/decay-rates-graph-2.png)
Numerical:
A radioactive source has a half-life of 2 hours. If the mass starts at 40mg, what will the mass be after 4 hours?
Graphical:
Several different times for the half-life can be calculated and averaged.