Amicroeconomist wants to determine how corporate sales are influenced by capital and wage spending by companies. she proceeds to randomly select 26 large corporations and record information in millions of dollars. a statistical analyst discovers that capital spending by corporations has a significant inverse relationship with wage spending. what should the microeconomist who developed this multiple regression model be particularly concerned with? a)normality of residuals b)randomness of error terms c)collinearity d)missing observations

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.