What is 60x-150=30?
(this is all the info i have for this question sorry! )

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).

Need solving this second acceleration problem.

Select the quadratic that has root x = 8 and x = -5