If 3 apples costs 6 dollars how much would 12 apples cost proportions

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).

Anyone know? will mark brainliest if you're correct!

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.