Explain how long will it take until 100 atoms of this isotope stay put active in the person? (A person accidentally breathes in 8 times 1018 atoms of this isotope). The first order rate constant for decay of the isotope if 0.086625 s-1
The equation looks like this: 100 = (8x1018)(e-.086625t)
Mathematically how to isolate t to get the amount of seconds?