I need help with how will we find y please someone tell me

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).

He concluded that a heavier object dropped from the same height as a lighter object will land

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)