A colony of bacteria is grown under ideal conditions in a laboratory so that the population increases exponentially with time. At the end of 4 hours there are 40 comma 000 bacteria. At the end of 6 hours there are 70 comma 000. How many bacteria were initially​ present?
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Part 1
There were approximately

enter your response here bacteria present initially.
​(Round to the nearest whole number as​ needed.)