Final answer:
Indeterminate sentences are open-ended while determinate sentences are solidly set.
Step-by-step explanation:
The best way to express the difference between indeterminate sentences and determinate sentences is that indeterminate sentences are open-ended while determinate sentences are solidly set.
Indeterminate sentences do not have a fixed length and can vary based on factors such as behavior and rehabilitation progress. This means that the person sentenced can potentially serve a range of time in prison.
On the other hand, determinate sentences have a fixed length that is determined by the judge or written in the law book. The person sentenced knows exactly how long they will be in prison.