The graph shows the US Department of Labor noise regulation for working without

Question

The graph shows the US Department of Labor noise regulation for working without ear protection. A machinist is in an environment where the ambient sound level is of 85 dB, i.e., corresponding to the 8 Hours/day noise level. The machinist likes to listen to music, and plays a Boom Box at an average level of 86.0 dB.

Calculate the INCREASE in the sound level from the ambient work environment level (in dB).  
3.54  

A student at a rock concert has a seat close to the speaker system, where the average sound intensity corresponds to a sound level of 116 dB. By what factor does that sound intensity exceed the 1.5- Hours/day intensity limits from the graph?
I can't get part 2 for the life of me please help!

Let me know if you still can't view it, I can see it

Explanation / Answer

For part 2 the 1.5 hour level is 97 dB

116- 97 = 19 dB

19 db -> factor of 10 ^ (19/10) = 79.4 times greater than the allowed level

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