Question

The initial amount of a substance is 267 grams. The amount of substance decreases by 12% every 8 years.
How many grams are left after 5 years?
What is the yearly decay factor?

What is the yearly decay rate?

Answer 1

You need the formula for decay factor and decay rate

Answer 2

\[267\times (.82)^{\frac{5}{8}}\] should do it for the first one

Answer 3

unless you are supposed to write this as
\[Q_0e^{kt}\]