Someone said 2+2=4, but 2+2=5. pls help ma tiny brain confuzion (and yes these are free points xd

PS: last time i post free points, prob? xd)

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).

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

See attachment below and find the equivalent of tan(∠qsr)