Which of the following is equal to the rational expression when x does not equal to 5 or -1 (x-7)(x+1)/(x+1)(x-5) a- x+1/x-5 b-x-7/x+1 c- x+1/x-7 d- x-7/x-5

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).

Someone . me. compound probability

Figure abcde is a regular pentagon. segment ae is located at a (2, 1) and e (4, 1). what is the perimeter of abcde? 4 units 6 units 8 units 10 units