Question

Bismuth-210 has a half-life of about 4 days. After 8 days, how many milligrams of a390 mg sample will remain? Round answer to the nearest tenth place. If answer doesnot have tenths place use a zero so that it does. Do not include the units.Please help me

Answer 1

Given Bismuth-210 has a half-life of about 4 days.

`\begin{gathered} \text{ After 4 days, }(1)/(2)(390\text{ mg\rparen = 195mg will remain} \\ \end{gathered}`
`After\text{ 8 days, }(195mg)/(2)=97.5mg\text{ will remain}`

The answer is 97.5mg