The equation 12x + 15y = 390 represents the total revenue during a one-day fundraiser. in the equation, x represents the number of youth t-shirts sold, and y represents the number of adult t-shirts sold. if there were 10 youth t-shirts sold, how many adult t-shirts were sold?

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).

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

Ineed to know the answer to this algebra question.