Answer
pitch of A, 437.5 Hz
Work Step by Step
$h=\frac{a}{1-\frac{s}{770}}$
note of G (392 Hz), 80 mph
$h=\frac{a}{1-\frac{s}{770}}$
$h=\frac{392}{1-\frac{80}{770}}$
$h=\frac{392}{1-.1038961}$
$h=392/.8961039$
$h=437.449$
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