Hi, I need help with this question. It has 4 multiple choice and one answer ques

Question

Hi, I need help with this question. It has 4 multiple choice and one answer question.

Edit: It resized the images, so I'll just retype the question:

(a) An observer on which submarine detects a frequency f ' as described by the equation above?

(b) In the equation above, should the sign of vS be positive or negative?

(c) In the equation above, should the sign of vO be positive or negative?

(d) In the equation above, what speed of sound should be used?

(e) Find the frequency of the sound detected by the crewman on submarine B. (Express your answer to four significant figures.)

Would greatly appreciate the help, and definitely will rate.

Explanation / Answer

a Sub A b. Positive, they are going in same direction c. Positive d. seawater e. 5.33 x 10^? I cannot see the sign on the 10(too blurry), so i cant solve this message me with this value and i'll solve it

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