I do not understand real numbers, help with work please.

[TigerMackis]

Today is first day of school. Teacher gave a paper with 4 questions on it, but I'm embarrassed that I do not know how to do it. The questions are:
1.List 5 examples of prime numbers that are also rational numbers
2.List 5 examples of composite numbers that are also rational numbers
3.Can a number be prime and irrational?Explain
4.Can a number be composite and irrational?Explain




Please explain to me the answer you give, I am searching the internet but it is not helping me. I am afraid I cant even get understand first day work I will fail this year.

 

[stapel]

Primality is defined on the whole numbers. The rationals are the fractions. Yes, technically all whole numbers are fractions, since you can put them over "1" (for instance, 3 = 3/1), but I have never heard of discussing primality in the context of rationality or irrationality.

Since an irrational is a non-terminating decimal, it certainly isn't a whole number, and never can be, so considerations of "prime" or "composite" are moot.

I have no idea what your teacher is trying to get at....

Eliz.