Problem 99 of 7
Choose the best long-term model from the decay of a radioactive substance shows its mass reducing by half every 5 years.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
use growth behavior, not just early values.
Hidden until you reveal it.
Evidence must support a long-term model choice, not just a one-step comparison.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Look beyond the first value.
2. Check whether differences or ratios are more stable.
3. Choose the model whose behavior best matches long-term evidence.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Choosing solely because one model has a larger starting value.