In δabc shown below, point a is at (0, 0), point b is at (x2, 0), point c is at (x1, y1), point d is at
(x sub 1/2 , y sub 1/2) and point e is at
( x sub 1+ x sub 2 /2, y sub 1 /2)

prove that segment de is parallel to segment ab.

Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 find the lower quartile, the median, and the upper quartile of the set? lower quartile: 19.5; median: 29.5; upper quartile: 42 lower quartile: 14; median: 27; upper quartile: 46 lower quartile: 18; median: 27; upper quartile: 38 lower quartile: 16; median: 29.5; upper quartile: 42