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calculus

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A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrient-broth medium divides into two cells every 20 minutes. The initial population of a culture is 51 cells.
(a) Find the relative growth rate. (Assume t is measured in hours.)
b)Find an expression for the number of cells after t hours.
(c) Find the number of cells after 8 hours.
(d) Find the rate of growth after 8 hours. (Round your answer to three decimal places.)
(e) When will the population reach 20,000 cells? (Round your answer to two decimal places.)

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