Exercise #2: A radioactive material has a halF-life of 35 ycars. If A, represents the original amount of it present and i represents the number of years it has been decaying, which of the following models the amount, A, of radioactive material still present after t-years? (1) A(t)=4 (0.5)*% (3) A(t)= 4,(2)*" (2) A(t)= 4 {0.5)śs (4) 4(t} = 4,{2)śs

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A: Cos(B) = ?

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