Write a function called interleave to interleave two row arrays of equal length. ex: for row arrays arrayone and arraytwo, the output row array is arraythree = [arrayone(1), arraytwo(1), arrayone(2) ,arraytwo(2), …]. the function should work for rows of any length. hint: create a new array by concatinating arrayone and arraytwo, then flattening the array to finally end up with the desired row array. no internal functions are needed. ex: flattening a=[1,2; 3,4] gives [ 1; 3 ; 2; 4]. restrictions: for and while loops should not be used.

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.