Mikey decides he wants to go for a run at 3:30 pm. He knows that the burger joint is 4.2 km away, the high school is 3.29 km away and the bank is 1.96 km away. He decides he will set out for the high school to see if any of his friends are there. After running to the high school and back, he looks at his watch and it's now 5:15 pm. What was the average speed of Mikey on his run?

(50 ) 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.