Answer
The poverty threshold in 2012 was around $\color{blue}{\$11,727}$.
Work Step by Step
Since $x=0$ corresponds to 1999 and $x=1$ corresponds to 2000, then $x=13$ corresponds to 2012.
Substitute $13$ to $x$ to obtain:
$y=2.719(13^2)+196.1(13)+8718
\\y=2.719(169)+2549.3+8718
\\y= 459.511+ 2549.3+8718
\\y=11726.811$
Thus, the poverty threshold in 2012 was around $\color{blue}{\$11,727}$.
