The tables to the right give price$-$demand and price$-$supply data for the sale of soybeans at a grain market, where $x$ is the number of bushels of soybeans $($in thousands of bushels$)$ and $p$ is the price per bushel $($in dollars$).$ Use quadratic regression to model the price$-$demand data and linear regression to model the price$-$supply data. Complete parts $($A$)$ and $($B$)$ below.

$\backslash$table$[[$Price$-$Demand$],[x,p=D(x)$