5. On August 1, 2013, there had only been 5 cases of West Nile virus reported in Texas. Due to recent rains, the number of cases would increase rapidly and by August 15th there were 23 cases. (4.5 points) a) Assuming a constant percent growth rate, write the equation to express the number of cases, N, as a function of t, the number of days since August 1. b) Interpret the growth rate of the equation. c) How many cases will there be on Sept 1?