A sample Chromium 51, used to track red blood cells, is measured to have an initial amount of 80 milligrams. Recall that exponential decay is modeled using:
A = A0e^(kt), k < 0
For this problem amounts are measured in milligrams and time in days.
(a) (3 points) Determine A0
(b) (3 points) The half-life of Chromium 51 is 26.2 days, meaning half of the sample will be left at that time. Using this and part (a), find a value for k.