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the quotient of a number and the sum of the number and 5 is -2

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).

Question and answers are in the attached picture. you so much in advance.

What is the absolute value of the complex number -4-sqrt2i