Which of the following relations is a function?
{ (1, 2), (1, 3), (1, 4), (1, 5) }
{ (1, 3), (2, 3), (4, 3), (9, 3) }
{ (5, 4), (-6, 5), (4, 5), (4, 0) }
{ (6, -1), (1, 4), (2, 3), (6, 1) }

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?