Algebra-1

Question Analysis
This question tests the student's ability to calculate the rate of change in a real-world context. The temperature decreases from 20°C to 10°C over 2 hours.

Key Concept Explanation
The rate of change is a measure of how much one quantity changes in relation to another. Here, the temperature is the dependent variable, and time is the independent variable.

Step-by-step Solution
1. Identify the change in temperature:
2. Identify the change in time: 2 hours; the temperature is decreased, so the change is .
3. Calculate the rate of change:

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