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Source 1 - 88 dB Source 2 - 85 dB Source 3 - 89 dB What is the sound pressure level with all three running?

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). Calculating the sound pressure using the following Sound Pressure Level (SPL)

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