2. A drug taken orally is absorbed into the bloodstream through the stomach. Let s, be the amount of the drug in the stomach at time t and let b, be the amount that has been absorbed into the bloodstream at time t. Each time step, 30% of the drug goes from the stomach into the bloodstream (no new drug enters the stomach). 75% of the drug in the bloodstream is metabolized (leaves the bloodstream). (a) Construct the matrix diagram for the above model. (b) Write the above system as a matrix equation (do not solve)