Use the equation you will find at
http://members.optusnet.com.au/scottsoftc/Chapter01/Chapter1f.htm
as well as your textbook, if you are using one.
0 dB corresponds to 10^-12 W/m^2 of sound intensity. Each 10 dB above that is a factor of 10.
1. What is the intensity of a sound at the pain level of 120 dB?
2. What is the intensity level of a sound whose intensity is 2.0 x 10^-6 W/m^2?
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