The average rainfall in Phoenix is 8.29 inches per year. The table shows recent data on the difference in annual rainfall from t
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This is a downward facing parabola, so its range comes in the form
where m is the y coordinate of the vertex of the parabola.
We can find the x coordinate of the vertex using
And if we plug -1 in the equation we get the y coordinate of the vertex:
So, the range is the interval