Given the formula S = 1/2 N (A+l) solve for n

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).

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

How can you construct perpendicular lines and prove theorems about perpendicular lines