Answer:
20.2
Explanation: Divide 726/34 and you get 20.16 round it and you get 20.2
I believe the answer is D
Answer: 1000 Hz
Explanation:
You can calculate frequency by dividing velocity by wavelength
Frequency = velocity/wavelength
Find velocity first.
900 m/3 s = 300 m/s
Plug values in to find frequency.
F = (300 m/s)/0.3 m
F = 1000 Hz