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9. (10 pts) Suppose the sound pressure level of each of three individual noise sources is measured at a point such that with each source

9. (10 pts) Suppose the sound pressure level of each of three individual noise sources is measured at a point such that with each source running individually, the sound pressure is as follows: Source 1 - 88 dB Source 2 - 85 dB Source 3 - 89 dB What is the sound pressure level with all three running? (Show how you got your answer).

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