Find a polynomial function with the zeros -1,0,3,1 whose graph passes through the point (1/2,15)

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

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?

How do i do this? i don’t understand