Thank you, that is very helpful!

The sentence I am trying to translate in full is "Calculate the distances." The intent of the message is that it's an instruction from a master spy to one of the agents in his network. I currently have:

"Рассчитай расстояний."

Does that sound like functional Russian?

While I don't know if I am using the correct case, it is heartening to see on the table you linked to that at least "расстояний" is the plural form of *one* of the cases.