A scientist is studying a chemical reaction where the concentration of a substance decreases over time. The concentration at a certain time is given by the expression. Simplify this expression to find the concentration. The answer is .
Answer & Analysis
Analysis
Question Analysis
This question tests the student's ability to apply the rules of exponents to a real-world scenario involving a scientific context.
Key Concept Explanation
The key concept here is that a negative exponent indicates the reciprocal of the base raised to the positive exponent. In this case, the base is a fraction, and the reciprocal of the fraction is taken.
Step-by-step Solution
1. Apply the rule for negative exponents:
2. Simplify the expression:
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