The number of people in a car that crosses a certain bridge is represented by the random variable x, which has a mean value μx = 2.7, and a variance σ2x = 1.2. the toll on the bridge is $3.00 per car plus $ .50 per person in the car. determine the mean and variance of the total amount of money that is collected from a car that crosses the bridge.

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.