A radioactive substance decays at a rate that can be modeled...

Question Analysis
This question tests the student's ability to apply an exponential decay model to a real-world scenario. The key is to correctly substitute the given values into the exponential function and compute the result.

Key Concept Explanation
Exponential decay models are used to describe situations where the rate of change is proportional to the current quantity. In this case, the initial amount of the substance is 1,000, and it decays by a factor of 0.8 each year.

Step-by-step Solution
1. Identify the given exponential function:
2. Substitute (since we are looking for the amount after 4 years):
3. Calculate

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Algebra-1

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