-17/10 = -1.7
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Zero
Only if the rational number is 0.
No - a square root of a negative number is an imaginary number. for example, sqrt(-9) is equal to 3i.
No, never.
Think of a numberline, Travle 5 sides to the negative side, and than 5 steps back , this is negative 5 and positive 5. This appplies for all rational numbers