Exponentional function

Question

there was a sample of 500 milligrams of a radioactive substance to start a study. since then, the sample has decayed by 3.6% 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 = 500(1 - 0.036)^t  or  y = 500(0.964)^t

 

 

Answer 2

y = 500(1 - 0.036)^t