Need , not remembering how to use the fundamental theorem with this.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Does the point (1, sqrt 7) lie on circle shown.

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74