You are flying at an altitude of 35,000 ft , what is approximate range of your commun

[Cows getting bigger]

I was taught 1.25 x square root alt (although there was some discussion at the time whether 1.23 was the newly preferred figure).

Of course, in reality I would appeal the question - What comms system (VHF/HF/SATCOM etc) am I meant to be using?