Ah, yes
if you start with P amount of something and the half life is h units (in years) and the time elapsed is t (in years) then the amount left is A
the equation is

so
given
h=1620
P=150
t=200
so


use your calculator
A≈137.69781917515g
about 138grams left
1/10 assuming there is are 10 typos in total
Answer:
Step-by-step explanation:
12/30 = 0.4
percent is rquivalent to 12/30 : 0.4×100 =40
Answer:
849000
Step-by-step explanation:
Anahdhsiendhd