WGU Applied Algebra Exam - Topic 2 Question 2 Discussion

The function is:

This is an exponential decay function because the base is between 0 and 1:

That means the sample's weight decreases over time.

We need to find the weight when:

Substitute into the function:

First calculate the exponent:

Now multiply by :

Rounded to two decimal places:

So the weight of the radioactive sample after 3 years is approximately: