Question

AC || DE. solve for x.

Answer 1

http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_0304_03/image0044e25b034.gif

Answer 2

I got 25

Answer 3

Those two lines parallel means that we have these two angles the same.

Answer 4

So we have 2 congruent angles, so the big triangle and the little triangle are similar, which lets you set up a proportion like this:
\[\frac{15}{6} = \frac{x+4}{2}\]