3. "Half-life" t₁/2 is a super important concept for first order decay cases. It is the time required for co tobe reduced to co/2, in other words, c/c = 1/2 when t= t₁/2. a. If k = 0.15/day as in Problem 2.a, find t₁/2. b. For the k value found in Problem 2.b., find t₁/2. c. We have talked in class about the concept of the "1/e time"... What are the 1e times for part a and part b, and how do they relate to the corresponding k values?