The value written as 2/7 is a rational number and the other options are irrational numbers.
<h3>What is a rational number?</h3>
A rational number is a number that does not end in a non terminating decimal. Surd forms as well as the value pi are all irrational numbers. We must note that the option that has no surd form or pi as a denominator is a rational number.
Hence; the value written as 2/7 is a rational number and the other options are irrational numbers.
Learn more about rational numbers:brainly.com/question/14297987
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Answer:
The circunference is represented by the equation is 
.
The graph of this function is presented in the attachment.
Step-by-step explanation:
The general equation of the circunferece is defined by the following formula:
(1)
We can determine the value of the coefficients by knowing three distinct points: 
, 
, 
The system of linear equations is:
(2)
(3)
(4)
The solution of this system is: 
, 
, 
.
The circunference is represented by the equation is .
The graph of this function is presented in the attachment.
Answer: 30 people
In the first vineyard, it needs 25 people working for 9 days to finish 30 acres of vineyard. Using this information you can determine the worker speed. The number of worker and days were given will increase the speed, but the area of the vineyard will decrease it. The calculation would be:
Worker speed= worker number * times given / vineyard area
Worker speed= 25 people * 9 days / 30 acres = 7.5 people days /acres
Applying the same calculation into the second vineyard would be:
Worker speed= worker number * times given / vineyard area
7.5 people days /acres = worker number * 5 days / 20 acres
Worker number= (7.5 people days /acres ) / 5 days x 20 acres= 30 people
