You just need to write a proportion between the correspondent sides:
Now, since 45 is 9 times 5, 18 must be 9 times A, and thus A must be 2.
Even if we didn't realize that, we can solve for A the usual way:
A.
Step-by-step explanation:
The person's question up above is A. I'm just putting it short. ;)
answer: the answer to your question is parallel
x=30
step-by-step explanation: