aprilstalder
07.06.2021 •
Mathematics
Radium decays according to the function
Q(t) = Qe-
where Q represents the quantity remaining after tyears and k is the decay
constant 0.00043. How long will take for 500g of radium to decay to 5g?
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Ответ:
x=1, y=2. (1, 2).
Step-by-step explanation:
3x+y=5
5x-4y=-3
y=5-3x
5x-4(5-3x)=-3
5x-20+12x=-3
17x-20=-3
17x=-3+20
17x=17
x=17/17=1
y=5-3(1)=5-3=2
x=1, y=2.