Idon't really understand how to do this. give me 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).

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?

What is perpendicular to y=-1/2x+11