What is the percent increase
from 3.49 to 3.89

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?

If i have 20$ and i gave 5$ away how much i got

How do i multiply two digit numbers