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 Sujet: doubling time
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 Two problems 2010-04-13 Dorothy pose la question :1. Explain why the number 123, 456, 789, 101, 112 cannot be a perfect square. (Hint: What is the units digit?) 2. A substance doubles in volume every minute. At 9:00A.M., a small amount is placed in a container. At 10:00A.M., the container is just full. At what time was the container one-eighth full?Robert Dawson lui répond. Doubling time 2005-03-12 Nick pose la question :Looking for the equation to how many years it will take to double the population given the growth rate is 7%.Penny Nom lui répond. A colony of bacteria 2000-04-22 Nicci Demmin pose la question :Suppose that the bacteria in a colony can grow unchecked, by the law of exponential change. The colony starts with one bacterium and doubles every half hour. How many bacteria will the colony contain at the end of 50 hours?Penny Nom lui répond.

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