Question

Help I don't know any of this 

Answer 1

3.1415... is not a rational number because it is continuous.

Hope I helped :)

Answer 2

Ratinonal numbers can repeat as long we can see the repeating part with a line over it (called a vinculum)
rational numbers can be written in form a/b where b is not equal zero

1.33333333333333 is repeating, it is 4/3

3.1415... is obviously an attempt to represent pi or π, the most famous irrational number

5.25 is easy, 5.25/1 or 525/100

0.6666666666666=2/3

the answer is 3.141592...