Foxhole radio problems that are way over my head

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Homework Statement


A radio station transmits 680kHz at a power of 50000W from a transmitter. Estimate the strength of the signal as it was received by the antenna 35 km away.


Homework Equations


I don't know any equation for this that's the problem!


The Attempt at a Solution


I can't find the relation between frequency, power and distance anywhere in my textbook T_T. My teacher is evil T_T.

This is an AP course btw T_T.
 
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