Step-by-step explanation:
We have been given that Bismuth-210 has a half-life of about 5 days.
To solve our given problem we will use half-life formula.
[tex]y=a\times(\frac{1}{2})^{\frac{t}{b}}[/tex]Where,
a = Initial value,
t = Time,
b = half-life.
Given:
[tex]\begin{gathered} a=1728mg \\ t=17 \\ b=5 \end{gathered}[/tex]Therefore,
[tex]y=1728(\frac{1}{2})^{\frac{17}{5}}[/tex]Simplify
[tex]y=163.69738\approx163.7mg[/tex]Hence, the answer is
[tex]163.7mg[/tex]