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22 May, 01:00

An element with mass 780 grams decays by 17.1% per minute. How much of the element is remaining after 19 minutes, to the nearest 10th of a gram?

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  1. 22 May, 02:53
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    22.1 grams

    Step-by-step explanation:

    At the end of each minute, (1 - 17.1%) = 82.9% of the element remains. At the end of 19 minutes, the quantity has been multiplied by that value 19 times, so the remaining amount is ...

    (780 g) (0.829^19) ≈ 22.1 g

    After 19 minutes 22.1 grams remain.
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