Algebra-1

Question Analysis
This question tests the understanding of exponential decay and the ability to solve for the base given a specific value of at a certain . The key is to recognize that 0 < b < 1 for exponential decay.

Key Concept Explanation
Exponential decay occurs when the base is between 0 and 1. The function decreases as increases. Given a specific value of at a certain , we can solve for by substituting the values into the function.

Step-by-step Solution
1. Substitute the given point (3, ) into the function