NEED HELP ASAP find value

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 many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2