What’s the bottom thing for the answer

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).

What is the solution of log2  (3x  -  7)  =  3? 4 5

What are the first 4 terms in the multiplication pattern given by the formula 2×4n