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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

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Solution:

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

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

The answer is 97.5mg

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