According to data provided by the US Department of Energy, the average price per gallon of regular gasoline in the United States from September 1, 2014, to December 1, 2014, is modeled by the function $F$ defined below, where $F(x)$ is the average price per gallon $x$ months after September 1.
$F(x)=2.74-0.19(x-3)$
The constant $2.74$ in this function estimates which of the following?
Difficulty: Hard
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