Algebra-1

Question Analysis
This question tests the student's ability to apply the exponential function model to a real-world scenario involving decay. The key is to identify the initial mass, the decay factor, and the number of years.

Key Concept Explanation
The exponential function () is used to model situations where the quantity decreases by a constant factor over equal intervals of time.

Step-by-step Solution
1. Identify the initial value:
2. Identify the decay factor:
3. Determine the number of years:
4. Substitute into the formula:

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