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Under ideal circumstances, a certain type of bacteria can triple every 20 minutes. If a sample of 5 bacteria is allowed to grow in ideal circumstances, answer the following.
(a) Find an equation for a model for the number of bacteria B after h hours have passed.
(b) Estimate the number of bacteria present after 3 hours.
(c) Estimate graphically when the number of bacteria will reach 1 million. (A graphing calculator is recommended. Round your answer to the nearest hundredth of an hour: Include units in your answer. More information.)