bacteria culture grows with constant relative growth rate. The bacteria count was 1,920 after 4 hours and 1,966,080 after 12 hours.   (a) What is the relative growth rate? Express your answer as a percentage. (Round your answer to two decimal places.)   (b) What was the initial size of the culture?   (c) Find an expression for the exact number of bacteria after t hours, y(t). y(t) =   (d) Find the number of bacteria after 10.5 hours. (Round your answer to the

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