A radioactive substance decays at a rate of 5% per day. If t...

Question Analysis
This question tests the student's ability to apply the exponential decay formula to a real-world scenario. The key is to understand that the decay rate (5% per day) must be used consistently.

Key Concept Explanation
Exponential decay is characterized by a quantity decreasing at a rate proportional to its current value. In this case, the radioactive substance decays by 5% each day, which can be modeled by the exponential function ().

Step-by-step Solution
1. Identify the initial amount .
2. Determine the decay factor (decay by 5% each day).
3. Substitute the number of days into the formula:

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Algebra-1

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