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Student response 9207.612

Correct answer 9164.147

frequency heard by the man = [1/(1-[u/v])} * frequency of whistle

u=39.9 m/s

v=343 m/s

frequency heard by the man=10419.7

so, the frequency of the whistle is 9207.612 but the correct answer is 9164.147

What did I do wrong? please help, thanks.