Find the missing length

I WILL GIVE BRAINLIEST

30

Step-by-step explanation: Assuming that the side lengths correspond with one another you can set up a ratio to solve

It should look something like this:   15/25 = 18/x

With this equation set up you can solve by cross multiplying. 25(18)=15x

Then start sloving:

25(18)=15x

450=15x

450/15=15x/15    (divide both sides by 15)

30=x

table 3 represents a direct variation function. : )