Which of the following sets corresponds to the set of positive even integers?

What subset of the number system includes numbers that are negative counting numbers?

What subset of the number system includes numbers that can be expressed as a fraction of two integers?

 What subset is best described as nonnegative numbers?

Which subset of the number system includes such as 1/2, -5, and 0.75?

Which of the following sets represent whole numbers?

Are all integers numbers considered rational numbers?

 What set pertains to the union of real and imaginary numbers?

 Which subset of the number system does the number 0 belong to?

Which subset of the number system includes numbers like $\sqrt[]{2}$ ,π (pi), and e?