CPM Homework Help : GC Problem 12-11

Multiple Choice: In the diagram at right, the value of $x$ is:

none of these

Two parallel segments, the top 9 units long and the bottom 6 units long, have a segment connecting the left endpoints and extending downward until it meets with the segment that connects the right endpoints extending downward, the distance between the 2 parallel segments is, x, and the distance between the bottom parallel line and where the left & right segments meet is 4.

Hint:

The diagram contains similar triangles. Use this fact to set up a proportion.

More help:

$\frac{6}{9} = \frac{4}{4+x}$

Answer:

b. $2$