1. **Problem Statement:** Identify which logarithmic function matches the given graph description.
2. **Given Functions:**
- $\log_{0.5} x$
- $\log_2 x$
- $\log |x|$
- $\ln x$
3. **Graph Description Analysis:**
- The graph passes through $(1,0)$, which is true for all logarithmic functions since $\log_b 1 = 0$ for any base $b$.
- The curve starts near $y=4$ at $x=0$ and decreases rapidly.
- The function decreases as $x$ increases, indicating a logarithm with base between 0 and 1.
4. **Key Logarithm Properties:**
- For $b > 1$, $\log_b x$ is increasing.
- For $0 < b < 1$, $\log_b x$ is decreasing.
- $\log |x|$ is undefined for $x \leq 0$ and symmetric about the y-axis.
- $\ln x$ is the natural logarithm with base $e > 1$, so it is increasing.
5. **Matching the Graph:**
- The graph decreases as $x$ increases, so the base must be between 0 and 1.
- Among the options, only $\log_{0.5} x$ has base $0.5$ which is between 0 and 1.
6. **Conclusion:**
The graphed function is $\log_{0.5} x$.
**Final answer:** $\boxed{\log_{0.5} x}$
Log Base 0.5
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.