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2 March, 02:19

An element with mass 670 grams decays by 27.3% per minute. How much of the element is remaining after 9 minutes, to the nearest 10th of a gram?

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  1. 2 March, 02:50
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    There will be 38 grams remaining.

    The equation would be of the form

    y = a (1+r) ˣ, where a is the initial value, r is the rate as a decimal number, and x is the amount of time. Using our values from the problem, we have:

    y = 670 (1-0.273) ^9 = 670 (0.727) ^9 = 38
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