Help with this I literally found the answer on chegg but it cost money smh.

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).

Me n o w. i need t h i s. 10 points

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2