(12) A doctor prescribes 125 mg of a drug that decays by 30% per hour. Write the formula for the decay of the drug in this form: f(t) = C-e .Find the value for k (b) rounded to six decimal places.

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter6: Vector Spaces
Section6.7: Applications
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**Problem Statement:**

A doctor prescribes 125 mg of a drug that decays by 30% per hour.

**Part (b):**  
Write the formula for the decay of the drug in this form: \( f(t) = C \cdot e^{kt} \). Find the value for \( k \) rounded to six decimal places.

**Explanation:**

This problem involves calculating the decay constant \( k \) in the exponential decay formula. Exponential decay can be described using the formula \( f(t) = C \cdot e^{kt} \), where:
- \( f(t) \) is the amount of drug remaining at time \( t \),
- \( C \) is the initial amount of the drug,
- \( k \) is the decay constant,
- \( t \) is the time elapsed,
- \( e \) is the base of the natural logarithm.

The drug decays by 30% per hour, meaning if \( C = 125 \) mg initially, after one hour, 70% of it remains. Use this information to solve for \( k \).
Transcribed Image Text:**Problem Statement:** A doctor prescribes 125 mg of a drug that decays by 30% per hour. **Part (b):** Write the formula for the decay of the drug in this form: \( f(t) = C \cdot e^{kt} \). Find the value for \( k \) rounded to six decimal places. **Explanation:** This problem involves calculating the decay constant \( k \) in the exponential decay formula. Exponential decay can be described using the formula \( f(t) = C \cdot e^{kt} \), where: - \( f(t) \) is the amount of drug remaining at time \( t \), - \( C \) is the initial amount of the drug, - \( k \) is the decay constant, - \( t \) is the time elapsed, - \( e \) is the base of the natural logarithm. The drug decays by 30% per hour, meaning if \( C = 125 \) mg initially, after one hour, 70% of it remains. Use this information to solve for \( k \).
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