Choose all that give the correct explicit and recursive formula for the sequence

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).

What is the value of x? enter your answer in the box. (cm)

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?