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At the race track, one race car starts its engine with a resulting intensity level of...

At the race track, one race car starts its engine with a resulting intensity level of 90.6 dB at point P. Then 8 more cars start their engines. If the other 8 cars each produce the same intensity level at point P as the first car, what is the new intensity level with all 9 cars running? Express answer in units of dB

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