Ineed bad this is so hard i don't know what to do

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

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 location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3