Question 1130956
You can answer part b without any calculation because you already know the half-life; so 36 hours to go grom 100% to 50%.


{{{v=220*(1/2)^(t/36)}}}------when t is 36, that is one half-life and v becomes 110.



Part (a)
That is 12 hours, for t=12.
Evaluate v.