The height of a plant varies directly with the amount of wat...

Question Analysis
This question evaluates the student's ability to apply the concept of direct variation to a real-world context and find the constant of variation.

Key Concept Explanation
In a direct variation, the relationship between two variables and can be expressed as , where is the constant of variation.

Step-by-step Solution
1. Identify the given values: inches and gallons.
2. Use the formula for direct variation: