During a fermentation experiment, the population P(t ) (in millions per mL) of bacteria Lactobacilli reuteri after t hours in a barley medium satisfied the differential equation 
Initially,1.5 million bacteria per mL were present.
(a) Determine the number of bacteria per mL after 7 hr.
(b) Determine when 9 million bacterial per mL will be present.
(a) 9 million
(b) 16.511 hours
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