$\pi$  is an example of which types of number?

If a number can be written as a fraction then it is which type of number?

The name given to positional numbers such as 1st, 2nd, 3rd, etc.

Which types of number is  $\frac{42}{37}$  ?

Which types of number is -542 ?

Which types of number is 18 ?

Which types of number is -3.712 ?

Which types of number is  $\sqrt{3}$  ?

Which set of numbers does this letter represent?