luiggie
17.09.2019 •
Mathematics
Aradioactive element has a half-life of 10 days. if 800 g of the element are now available in a laboratory, how much will remain after 25 days?
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Ответ:
Ending amount= Beganing amount/2^n
= 800/2^2.5
= 141.41g
Ответ:
2)-3x+y = -5
1) - 2) => 11x = -11 => x = -1 => 3 + y = -5 => y = -8
solution is (-1,-8)