Me
is the number rational or irrational?

column a

column b

ab

1.

square root of 40 over 10 end root

ab

2.

8 pi

ab

3.

1 over 6

ab

4.

syntax error from line 1 column 53 to line 1 column 60. unexpected '0'.

a.

rational

b.

irrational

Rational numbers are numbers that can be written as a ratio or a fraction. 

Irrational numbers are the opposite of rational numbers, it can't be written as a fraction; instead, it is written as a decimal number. 

1) square root of 40 over 10 end root.
√ 40/10 ⇒ √4 ⇒ 2 ⇔ rational number. 2 can be written as 2/1, a fraction.

2) 8 pi 
8 is a rational number while pi is an irrational number.
8 * 3.14159265359 = 25.1327412287  ⇔ irrational

3) 1/6 ⇔ rational

4) I don't understand the data given.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.