Yes.
Yes. It's -6 .
The definition of rational means it can be expressed as a fraction were the top and bottom numbers are whole numbers so the negative square root of 36 (-6) is rational because it can be expressed as a fraction -6/1 or 12/-2 or anything like that. Hoped this helped =)
36 is a rational number
It is because 6 is one of the rational numbers, which are anything ranging from negative numbers, positive numbers, ratios, fractions and decimals, and repeating decimals.
rational