How to calculate Radio range with line of sight?

Question:

Congratulations blonde whatever your name is you do prove stereotypes accurate do you feel special? By the way I know height of antenna and the band I want.

Answers:

Free space loss in dB = 20 log (d) + 20 log (f) +37 for d in miles and f in mhz. You need to know transmitter power in dbm (0 dbm is 1 milliwatt), transmitter antenna gain in db's, space loss, receiver antenna gain in db's, and receiver sensitivity in dbm's. Understand you want to have a 10db margin or more

wtf?! yeah im totally not going to take tht class.....hold up...wat class is tht? lol.