Here are the ages of the 11 people who are attending a party: 10, 14, 14, 14, 15, 15, 17, 18, 29, 31, 47. One of the partygoers' great-grandfather, who is 95 years old, arrives late to the party. Select whether the value of each statistic for the ages increases, decreases, or cannot be determined when the great-grandfather's age is added.

Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.