A rational number is any number that can be written as a fraction, while irrational is the exact opposite.
[tex]\sqrt{x=49}[/tex] is rational as it equals 7 and can be written as 7/1
Our second number has a dash above the 97, this simply means 97 repeats forever : -20. 97979797979779..... this number IS rational as even though 9797979.... goes on for infinity it CAN be written as a fraction.
[tex]\sqrt{19}[/tex] is not rational as it is equal to 4.35889894..... and cannot be written as a fraction since it repeats infinitely but with different numbers
-9/2 is rational since its a fraction
