How do you balance out these equations?

To balance an equation you want there to be the same number of each element on both sides
b) CO+O2 yields CO2
Count the number you have of each element on each side
There is one C on both sides but there are three O on the left side but only two on the right side
So you would add coefficients to make the O equal
2CO+O2 yields 2CO2
Now it's balanced because you have 2 C on each side and 4 O on each side

If you need help with any others let me know!

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.