Find the percent of increase for 4 to 7. round to the nearest tenth if necessary. also someone explain how to do this.

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).

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

Issof claims that the scale factor is 1/2. which statement about his claim is correct