PLZ PLZ PLZ PLZ PLZ PLZ HELP ME I DONT UNDERSTAAND I NEED ANSWERS SOME OF THEM I ACCIDENTLY CLICKED ON WHEN I TOOK THE PICTURE PLZ

7x+8y=-18, 4x-9y=-3 solve the system of equations

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?

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6