Please really need help on this been trying n this one

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).

How do the graphs of y = 1/x and y=5/x+6 compare?

Solve the equation x/4 - 5= -8 -27 -12 -7 12