To complete your sentences based on the graph described, we can infer the following:
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The point on the line shows that after 12 hours, the pool has 3,300 gallons of water.
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This is a unit rate of 275 gallons every hour. The slope of the graph is therefore 275.
(Note: The unit rate of 275 gallons per hour assumes that the increase from the initial amount to 3,300 gallons over the 12-hour period is calculated, which might look like \( \frac{3300 - 0}{12 - 0} = \frac{3300}{12} = 275\) gallons/hour.)
If the actual numbers differ based on the graph you've mentioned, please adjust the numbers accordingly.