PLEASE HELP! Carla and Jonah are working together to determine if quadrilateral CDEF with coordinates C(2, 3), D(1, 2), E(4, 1), and F(5, 3) has a right angle.

Carla sets up the following equations:
the slope of segment CD equals 2 minus 3 all over 1 minus 2
the slope of segment DE equals 1 minus 2 all over 4 minus 1

Jonah sets up the following equations:
the slope of segment CD equals 2 minus 3 all over 1 minus 2
the slope of segment EF equals 3 minus 1 all over 5 minus 4

Who is on track to get the correct answer and why?

Abottled water distributor wants to estimate the amount of water contained in 1-gallon bottles purchased from a nationally known water bottling company. the water bottling company’s specifications state that the standard deviation of the amount of water is equal to 0.02 gallon. a random sample of 50 bottles is selected, and the sample mean amount of water per 1-gallon bottle is 0.995 gallon a. construct a 99% confidence interval estimate for the popula-tion mean amount of water included in a 1-gallon bottle. b. on the basis of these results, do you think that the distributor has a right to complain to the water bottling company? why? c. must you assume that the population amount of water per bottle is normally distributed here? explain. d. construct a 95% confidence interval estimate. how does this change your answer to (b)?