How would I word that it is being doubled in size?

The question is how did D get to E. ​

What is the percent of increase for a population that changed from 438,000 to 561,000

Given the points a(-2, 1) and b(8, 6), find the coordinates of the point c on directed line segment ab, that partitions ab in the ration 2: 3.

Find the coordinates of point x that lies along the directed line segment from y(-8, 8) to t(-15, -13) and partitions the segment in the ratio of 5: 2.