What is the greatest number of acute angles that a triangle can contain ?

What number produces an irrational number when multiplied by -1.25

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?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes