A radioactive substance decays at a rate of 4% per year. If ...

Question Analysis
This problem evaluates the ability to calculate the remaining amount of a substance after a given number of years using an exponential decay model.

Key Concept Explanation
The formula for exponential decay is , where is the amount after years, is the initial amount, is the annual decay rate, and is the time in years.

Step-by-step Solution
1. Identify the given values: , , and .
2. Substitute these values into the formula:

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Algebra-2

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