This is an easy half-life calculation because it involves an exact integer of half-lives. 1,104 days is precisely 8 half-lives. After each half-life, one half of the original remains. So, after 8 half-lives you will have 1 / 2^8 of the original material left. So we start with 30 grams and 1 / 2^8 =
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0.00390625</span></span></span>. We are therefore left with (30 *
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0.00390625) or </span></span></span>
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0.1171875 grams of the original 30 grams of polonium.
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Since we need to combine the amounts he ran on each day we need to add. We need to add normally and then add the decimal after the number 4. make sure to add km at the end to label your answer.
