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OpenStudy (anonymous):
The half-life of radioactive radon gas is 3.8 days. How much of 100 mg of the gas will be left after 9 days? 23.4 mg 14.7 mg 19.4 mg 36.7 mg
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OpenStudy (amistre64):
how many times does 3.8 go into 9?
OpenStudy (anonymous):
2.3 times
OpenStudy (amistre64):
2.368 time, so its gonna split in half that many times
OpenStudy (amistre64):
so im guessing we have 100*(1/2)^(2.368)
OpenStudy (anonymous):
I get 10547.77
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OpenStudy (amistre64):
then you did something wrong lol
OpenStudy (anonymous):
lemme try again
OpenStudy (anonymous):
Ohh Okay I got 19.4 mg messed up my order of operations
OpenStudy (amistre64):
thats better :)
OpenStudy (anonymous):
Thank you!
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OpenStudy (amistre64):
yep
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