Which of the following is not a correct form of the quadratic function?

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).

Find the value of the cosine for angle a

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?