What is the fractional equivalent of the repeating decimal 0.2 ?

The highest common factor of 132 and 220

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 solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68