How can you tell what a real number is?

Question

anonymous · Answer

it is basically any number

anonymous · Answer

decimals while numbers anything or all

anonymous · Answer

So how would you be able to estimate a domain and range if it's possible to have all real numbers?

anonymous · Answer

well u just say the set of real numbers$$\in R$$

anonymous · Answer

Ohhh!!! drr... Thank you!

dumbcow · Answer

or you can use 
$$(-\infty,\infty)$$

anonymous · Answer

To answer that question, it is better to know what are considered NON-REAL. Complex numbers(square root of a negative number), numbers resulting from division by zero are examples of NON-REAL numbers. Anything else that is well defined in Mathematics (irrational,pi, e, fractions, integers) are considered REAL.