What is the answer to 1 3/8 + 4 1/6 =?

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?

Me n o w. i need t h i s. 10 points

Which statements are true about additional information for proving that the triangles are congruent check all that apply