1. The problem asks which r-value represents the strongest negative correlation. 2. The correlation coefficient $r$ ranges from $-1$ to $1$. 3. A value closer to $-1$ indicates a stronger negative correlation. 4. Among the given values: $-0.7$, $-0.22$, $0.38$, and $0.9$, the negative values are $-0.7$ and $-0.22$. 5. Since $-0.7$ is closer to $-1$ than $-0.22$, it represents a stronger negative correlation. 6. Positive values $0.38$ and $0.9$ represent positive correlations, so they are not considered for strongest negative correlation. **Final answer:** The r-value $-0.7$ represents the strongest negative correlation.