There was a sample of

Question

550
milligrams of a radioactive substance to start a study. Since then, the sample has decayed by
5.2%
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 = 550 * 0.948^t