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The problem asks to find the rate of change between the years 2018 and 2020 based on the obstacle course completion times. 

From the table:
- 2018: 27 minutes
- 2020: 22 minutes

The formula for the rate of change is:

\[
\text{Rate of Change} = \frac{\text{Change in Time}}{\text{Change in Years}} = \frac{T_2 - T_1}{\text{Year}_2 - \text{Year}_1}
\]

Substitute the values from 2018 and 2020:
\[
\text{Rate of Change} = \frac{22 - 27}{2020 - 2018} = \frac{-5}{2} = -2.5 \, \text{minutes per year}
\]

The rate of change between 2018 and 2020 is \(-2.5\) minutes per year.

Would you like any further details or explanations?

Here are 5 related questions for practice:
1. What is the rate of change between 2019 and 2022?
2. If the trend continued, what would the time be in 2023?
3. How do you interpret a negative rate of change in this context?
4. What would the rate of change be if the times had increased instead?
5. How can we use the rate of change to predict future times?

**Tip:** The rate of change helps measure how one quantity changes relative to another, such as time over years!

According to the table, what was the rate of change between 2018 and 2020?

Find the rate of change in obstacle course completion times between 2018 and 2020 using a step-by-step solution. This problem involves calculating the rate of change using the formula (Change in Time) / (Change in Years). Suitable for Grades 7-8.

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