During an epidemic, the number of people who have never had the disease and who are not immune (they are susceptible) decreases exponentially according to the following function, where t is time in days. f(t) = 17,000e 0.04t Find the number of susceptible people at each time. (a) at the beginning of the epidemic (b) after 9 days (c) after 4 weeks (a) The number of susceptible people at the beginning of the epidemic is . (Round to the nearest whole number as needed.) (b) The number of susceptible people after 9 days is (Round to the nearest whole number as needed.) (c) The number of susceptible people after 4 weeks is (Round to the nearest whole number as needed.)