Answer:
hon you never asked a question or added an image. id be happy to try and help if you do!
Answer:
12
Step-by-step explanation:
Step-by-step explanation:
<u>The </u><u>correct</u><u> </u><u>is </u><u>a </u><u>4</u><u>s</u><u>e</u><u>c</u><u>(</u><u>4</u><u>x</u><u>)</u>

---Cross multiply
2x = 36
---Divide both sides by 2
x = 18
Hope this helps!
I have no "real" answer, because the river may curve...
Fun answer: farmer Ed clearly does not realize you can Not create a rectangular plot that borders a river unless it is artificial and instead of dirt, it would Need to be concrete to ensure a constant straight edge; although even in that case, it would no longer Be a river! It would be a mote or channel. So this problem is unsolvable at his current standards.