Hey EJdive43.
Does it decay continuously or only in hourly intervals?
Hello, EJdive43!
A radioactive substance decays at a rate of 3.5% per hour.
What percent of the substance is left after 6 hours?
First, set up the function.
The substance loses 3.5% every hour.
That is, 96.5% of the substance remains.
We have: . . where
When , we have: .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
Therefore: .