4. A radioactive sample with an initial mass of 85mg has a half-life of 10 days A.write a function to relate the amount remaining A, in milligrams, to the time,t, in days? B. what amount of radioactive sample will remain after 20 days? round to the nearest hundredth of a unit. C.what amount of radioactive a sample was there 30daysago? Round to the nearest hundredth of the unit. D. how long, to the nearest day, will it take for there to be 17mg of the initial sample remaining?

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