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**Unformatted text preview: **a) How many milligrams will be present after 2 hours? (round answer to 1 decimal) b) When the number of milligrams reaches 1, the drug needs to be administered again. When (after how many hours) will the drug need to be administered? (round answer to 2 decimals) 11) The population of Collin County, which follows the exponential growth model, increased from 264,000 in 1990 to 490,000 in 2000. a) Find the exponential growth rate, k. (do not round k---use ALL decimals on the calculator) b) Write the exponential growth function. ______________________t A(t) = _________________ e (continued on the next page) c) What will the population be in 2012? (round your answer to the nearest whole number) d) When (in which year ) will the population be 640,000?...

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