theflash077
17.01.2020 •
Mathematics
An element with mass 670 grams decays by 21.8% per minute how much time is remaining after 15 minutes
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Ответ:
16.75622173 grams.
Step-by-step explanation:
21.8% + 78.2% = 100%
There is 78.2% of the original remaining each minute.
670g * 0.782^15
It's to the power of 15 because it's done 15 times.
16.75622173 grams are remaining.
Ответ:
After 15 minutes 16.75 g are remaining
Step-by-step explanation:
After each minute, the amount remaining is 100 - 21.8 = 78.2% = 0.782 times as much as was present at the start of the minute. So after 1 minute there is 670*0.782 = 523.94 g. After 2 minutes there is 523.94*0.782 = 409.72 g, which is equivalent to 670*0.782^2. Then the general formula is:
m = 670*0.782^t
where m is the mass remaining (in grams) and t the time elapsed (in minutes)
After 15 minutes:
m = 670*0.782^15 = 16.75 g
Ответ:
555 divided by 1/4 is 2220