2points

three runners competed in a race. data were collected at each mile mark for

each runner. if the runner ran at a constant pace, the data would be linear. a

regression line was fitted to their data. use the residual plots to decide which

data set is best fit by the regression line, and then identify the runner that kept

the most consistent pace.

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?

(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.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?