Algebra-1

Question Analysis
This question tests the student's ability to apply the concept of zero slope to a real-world scenario involving a quantity that remains constant over time.

Key Concept Explanation
If the water level in the tank does not change as time passes, the graph of water level versus time will be a horizontal line, which indicates a slope of 0.

Step-by-step Solution
1. Understand the scenario: the water level remains unchanged over time.
2. Recognize that a constant value over time ...