At a rock concert, a dB meter registered 125 dB when placed 2.2 mm in front of a loudspeaker on the stage. The intensity

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At a rock concert, a dB meter
registered 125 dB when
placed 2.2 mm in front of a loudspeaker on the
stage. The intensity of the reference level required to determine
the sound level is 1.0×10−12W/m21.0×10−12W/m2.
1. What was the power output of the speaker, assuming uniform
spherical spreading of the sound and neglecting absorption in the
air?
2. How far away would the sound level be 82 dB?