{1,2,3,4,5,6....} is an example of what kind of subsets of real number?

{0,1,2,3,4,5,6....} is an example of what kind of subsets of real number?

{...-3,-2,-1,0,1,2,3,....} is an example of what kind of subsets of real number?

{2/5. 5.09, -8, 0 - 6/7} is an example of what kind of subsets of real number?

 $\sqrt{3}$   $\pi$  , 5.4444444....} is an example of what kind of subsets of real number?

Which of the following numbers arrange in increasing order?

Which of the following numbers arrange in decreasing  order?

The smallest negative integers is -1.

All numbers greater than zero are positive integers.