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The number of milligrams () of a certain drug that is in a patient's bloodstream hours after the drugs injected is given by the flowing function DO) - 500-225 When the number of milligrams reaches 21. the drug is to be injected again. How much time is needed between injections? Round your answer to the nearest tenth and do not found any intermediate computation hours

At the beginning of a study, a certain tre of bacteria has a population of 10. The population grows according to scos ponto 11 days, there are 124 bacteria (a) Lett be the time to days) since the beginning of the study and let be the number of bacteria at time Write a formula relating to Use exact expression to in the missing parts of the formula Do not use approximations X 2 -20 (6) How many bacters are there 21 days after the beginning of the study? Do not round any intermediate computation and round your answer to the nearest whole number bacteria

The mass of a radioactive substance follows a coexponenti decay model, with a decay rate parameter of per day. Hind the oth substance that is the time it takes for one-half the original amount in a given sample of this substance to decay) Note: This is a connus exponential decay model Od not round any intermediate computations, and round your answer to the nearest hundredth 5 2