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OpenStudy (anonymous):
Please help! A material decays at a rate of 1.1% per year. If you start with 250 grams of the material, in how many years will there be 100 grams remaining? Round to one decimal place. What equation correctly models the situation?
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OpenStudy (anonymous):
100=250(1-1.1/100)^T Now solve
OpenStudy (anonymous):
It's an exponential decrease so just use it
OpenStudy (anonymous):
By dividing both sides by 250 first?
OpenStudy (anonymous):
yeap
OpenStudy (anonymous):
.4=.989^t?
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OpenStudy (anonymous):
Now take log on both sides
OpenStudy (anonymous):
T=(ln 0.4/ln.989)
OpenStudy (anonymous):
Yay I did it right :) Thank you roshan2004.
OpenStudy (anonymous):
Most welcome mate!
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