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HalpMehPlz
22.06.2019 •
Mathematics
The half-life of a radioactive kind of element is 18 minutes. how much will be left after 36 minutes, if you start with 32 grams of it?
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Ответ:
There will be 8 grams left after 36 minutes.
Step-by-step explanation:
A half-life is how long it takes for half of the amount to go away. In this case, we see that we have two half-life periods worth, which you can determine by dividing the total time by the half-life time.
36mins/16mins = 2 half lives.
Now we can raise 1/2 to the power of how many half lives we have (2). Then we multiply that by the amount in the sample.
(1/2)^2 * 36
1/4 * 36
8 grams
Ответ:
Idk if theres more to the question but I think it's a 90 degree counterclockwise around the origin and then a reflection across the y-axis.