Yes - all numbers that can be written as ratios, even negative numbers, are rational numbers.
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Yes.
No. An irrational number is any number that is not a rational number; A rational number is any number that can be expressed as one integer over another integer. negative 3 over 4 is one integer (negative 3) over another integer (4), and so is a rational number.
It is rational because it terminates.
Yes, 1/6 is a rational number
-1/6 since the number is smaller than what is being subtracted the answer will be negative to get it you simply subtract the smaller number from the bigger and add the negative sign