Look at the picture.
ΔZYX and ΔDYC are similar. Therefore the lengths of sides are in proportion:

DC = x
ZX = 16
DY = a
ZY = a + a = 2a
Substitute:

<em>multiply both sides by 16</em>

<h3>Answer: CD = 8</h3>
Answer:
x= -3 , -7
Step-by-step explanation:
X-15+9-4=x-10 there are ten fewer people after the second stop than the original amount