OC is perpendicular to AB. What is the length of AB?
3.6

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).

Through: (-3,-3) parallel to y= 7/3x+3

Solve the triangle. a = 21°, c = 105°, c = 5