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# need help

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An element with a mass of 700 grams decays by 6.1% per minute. To the nearesttenth of a minute, how long will it be until there are 220 grams of the element remaining?

Sep 16, 2020

#1
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220 = 700 x  (0.939)^m

220/700 = (0.939)^m

m = Log(220/700) / Log(0.939)

m =18.4 minutes

Sep 16, 2020
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