Question

Please I need help ASAP

Answer 1

Answer: 50 mg

Explanation:

Substituting into the half-life formula, we get that

`N(t)=800\left((1)/(2) \right)^(t/25)`

So, after 100 years,

`N(100)=800\left((1)/(2) \right)^(100/25)=\boxed{50 \text{ mg}}`