A train whistle is 580 Hz when stationary. It is coming toward you at 18.8 m/s. What frequency do you hear?
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Hey there!
The unit rate is 8.30 for every hour.
If he earns $8.30 an hour and works 9 hours, multiply 8.30 by 9.
8.30 x 9 = 74.70
Hope this helps!