If the intensity level of one trombone is 70 db, calculate a reasonable estimate for the intensity level of 76 trombones all playing simultaneously in the same place.

89 or 90 dB looks reasonable

Explanation:

¶ = (10 dB) log (I/Io)

from the relation above

For each doubling of intensity, we increase 3 dB (10×log 2 = 3)

Given that one (1) trombone = 70dB

2 > 73 dB

4 > 76 dB

8 > 79 dB

16 > 82 dB

32 > 85 dB

64 > 88 dB

128 > 91 dB

Good luck

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the device is called “ rocket engine”