An element with mass 820 grams decays by 26.8% per minute. How much of the element is remaining after 18 minutes, to the nearest 10th of a gram?
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TRIGONOMETRY
Ahs B. asked • 02/26/18
An element with mass 730 grams decays by 27.6% per minute. How much of the element is remaining after 12 minutes, to the nearest 10th of a gram?
can someone please solve?
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Arturo O. answered • 02/26/18
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This is not a trigonometry question.
After each minute, the amount remaining is (100 - 27.6)% = 72.4% = 0.724 times as much as was present at the start of the minute. If t is the number of minutes elapsed from when you had 730 g, then
m(t) = 730 (0.724)t,
with t in minutes and m(t) in g.
m(12) = 730 (0.724)12 g = ? g
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