Your school's choir, consisting of 10 singers, performs with an intensity of 100dB. At a point in the performance, a soloist steps forward and sings with an intensity of 90dB.
A. How many times more intense is the full 10 person choir than the soloist alone?
B. After singing for a few, the soloist rejoins the choir. A second choir, consisting of 90 people, joins the smaller choir. Each group of 10 singers sing with the same intensity as the first 10 singers. Now how many more dB of sound are being produced? Show work.
C. You attend a rock concert a few weeks later that plays at 120dB. How many times more intense is the rock concert than the choir concert?

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