Answer:
r = 15
Step-by-step explanation:
I don't really have an explanation, I'm just good at quick math,
I'm sorry if you wanted an explanation, I would explain but I am really bad at explaining math.
I think your best answer is a pasture that is 75 feet by 150 feet, which will give you 11,250 sq ft of pasture
The answer to your question is x= -12 hope this helps ! Makes sure you put the negative !