A. a researcher claims that 20% of students spend more than 10 hours a week on homework asignments and studying. a random sample of 53 students were surveyed and 18 of them said they spend more than 10 hours a week on homework assignments and studying. construct a 95% confidence interval to test the researcher's clain ie, is the value 20% within the confidence interval? you must show the value of e, p, and za/2 rounded to 4 significant digits.

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.