Answer:
it should be 17.9, I don't really know how to explain it I'm sorry-
Iron bridge is the first bridge to be ever built

Your answer to this is :
<h2>
C. Stretching.</h2>
<h2>→ <u>Explanation:-</u></h2>
<u />
Because the other one is congruent together.
Hopefully This Helps ! ~
#LearnWithBrainly

<em>Jaceysan ~</em>
The answer is Y= -6 !!!!!!!