Match each function with the description of its graph ​

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).

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?