Question

There was a sample of 350 milligrams of a radioactive substance to start a study. since then, the sample has decayed by 7.1% each year. let t be the number of years since the start of the study. let y be the mass of the sample in milligrams. write an exponential function showing the relationship between y and t .

Answer 1

y = Ae^(-kt), where y is the mass in milligram of the sample at time t, A is the initial amount, and k is the decay rate and t is the time So the exponential function showing the relationship between y and t. y = 350e^(-0.07t)