Why must trapezoids be congruent

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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 hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?