Population Growth The number of a certain type of bacteria increases continuously at a rate proportional to the number present. After 2 hours, there are 200 bacteria, and after 4 hours, there are 700 bacteria. (a) Find an exponential model for the population P after t hours. P(t ) = (b) How many bacteria will there be after 7 hours? (Round your answer to two decimal places.) bacteria (c) How long will it take (in hours) for the population to double? (Round your answer to two decimal places.) hours Need Help? Read It