Formula to calculate the sum of angles for an n-sided

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).

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Find the value of x that will make l ll m