One such polynomial might be

Another with the same roots would be
I can help explain it if you PM me.
Answer:
18 inches
Step-by-step explanation:
To to this you would just divide 54 by 3 and you would get how far away from the endpoint which is 18 inches
Answer:
Yes
Step-by-step explanation:
The difference of 18 and 3 is 15 which can be expressed as fraction, so its a rational number.