1. In a certain culture of bacteria, the rate of increase is proportional to the number...

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1. In a certain culture of bacteria, the rate of increase is proportional to the number present. (a) If it is found that the number doubles in 4 hours, how many may be expected at the end of 12 hours? (b) If there are 104 at the end of 3 hours and 4 x 10' at the end of 5 hours, how many were there at the beginning? 1. In a certain culture of bacteria, the rate of increase is proportional to the number present. (a) If it is found that the number doubles in 4 hours, how many may be expected at the end of 12 hours? (b) If there are 104 at the end of 3 hours and 4 x 10' at the end of 5 hours, how many were there at the beginning?