Help with these questions please, i will mark you brainliest!!

Use the grouping method to factor x^3+ x^2 + 3x +3

49xy +34y - 72z. determine the degree of the polynomial

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).