Plz help! Im confused ehehhehe

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).

Abig remake 100 loaves of bread in one day how many loaves does the bakery make in 6 days

Which of the following is correct interpretation of the expression -4+13