To calculate the rate at which the rain is falling, we can look at the change in rainfall over time.
From the graph you provided:
- At 0 hours, the rainfall is 10 inches.
- At 1 hour, the rainfall is 9 inches.
- At 2 hours, the rainfall is 8 inches.
- At 3 hours, the rainfall is 7 inches.
The overall decrease in rainfall from 0 to 3 hours is: 10 inches - 7 inches = 3 inches.
The time elapsed is: 3 hours - 0 hours = 3 hours.
Now we can find the rate of rainfall decrease: \[ \text{Rate} = \frac{\text{Total decrease in rainfall}}{\text{Total time}} = \frac{3 \text{ inches}}{3 \text{ hours}} = 1 \text{ inch per hour}. \]
So, while you mentioned that 1 was incorrect, based on the information provided, the rate of rainfall falling is \(1\) inch per hour.
If this was considered incorrect, it's possible there may be misinterpretation of the data or instructions. Please verify the data or the conditions of the question again.