Can someone with this geometry problem

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30