Three dentists wanted to compare the ages of their patients. they each calculated their patients’ mean age and the mean absolute deviation of their ages. they displayed the results in a table.
which statements are true?
choose exactly two answers that are correct.
dentistmean patient agemad
appiah439.7
cantwell2913.9
singh4114.1
a. dr. appiah’s patients’ ages vary more than do dr. cantwell’s patients’ ages.
b. dr. appiah’s patients’ ages vary less than do dr. singh’s patients’ ages.
c. dr. cantwell’s patients’ ages and dr. singh’s patients’ ages vary about the same amount.

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.