[ Mathematics ] Open Question : The number of bacteria in a culture is modeled by n(t)=1820e^0.4t?

The number of bacteria in a culture is modeled by n(t)=1820e^0.4t (a) The initial number of bacteria is__________ (b) The relative rate of growth of this bacterium population is___________ (c) The number of bacteria after 3 hours is__________ (d) After how many hours will the number of bacteria reach 10,000? Your answer is___________

Source: http://answers.yahoo.com/question/index?qid=20110711225926AAmJAyf

Anne Hathaway Nicole Richie Justin Bieber