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To calculate the rate of change in the diver's elevation, you can use any two points from the graph. The formula for the rate of change is:
\[
\text{Rate of Change} = \frac{\text{Change in Elevation}}{\text{Change in Time}} = \frac{E_2 - E_1}{t_2 - t_1}
\]
Where:
- \(E_1\) and \(E_2\) are the elevations at time \(t_1\) and \(t_2\) respectively.
Please provide specific coordinates or points from the graph, and I can help you calculate the rate of change in the diver's elevation in feet per minute.