model(1.11)R(n+1)=R(n)+0.6I(n) I(n+1)=I(n)-0.6I(n)+0.001407I(n)S(n) S(n+1)=S(n)-0.001407S(n)I(n) I(0)=5,S(0)=995,R(0)=0 In model (1.11) determine the outcome with the following parameters changed: a. Initially 5 are sick, and 15 are sick the next week. b. The u lasts 1 week. c. The u lasts 4 weeks. d. There are 4000 students in the dorm; 5 are initially infected, and 30 more are infected the next week