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The idea of a doubling period applies to certain everyday situations. For example, under optimum conditions, bacteria reproduce by splitting in two. Their numbers increase geometrically over time. Suppose at noon on a certain day, there are 1000 bacteria in a dish. At 6 P.M. on the same day, there are 8000 bacteria. 5. If a count is taken every 40 min, how many terms are in the sequence? What is the common ratio? There are a total of ten terms in the sequence. 12:00, 12:40, 1:20, 2:00, 2:40, 3:20, 4:00, 4:40, 5:20, and 6:00.