Can you please explain Test 7 section 4 question #22 ?

# How would you solve this one? Please see the link to the pic below.

How would you solve this one? Please see the link to the pic below.

# Can you please explain how to solve Similar triangle problems?

Hello Mr. Mike. Can you please explain how to solve Similar triangle problems? I especially find confusing identifying equal sides and making proportions. I have an example problem, please see the link below.

http://ibb.co/fLJ1Hc