Because I do not know the context of what is "cool," I am going to assume that is referring to the weather/temperature.
In Spanish, we use the verb "hacer" in expressions that refer to weather conditions.
The direct translation of "It is cool," is:
Hace fresco.
We use the third singular form of the verb hacer because we are talking about the weather.
This isn’t an equation— equations require an equal sign and a variable of some sort on the other side of that said equal sign. Sorry.
1.en
2.para
3.por
4.hasta
i hope that helps
