Since the given interval is
Then any number starting from zero to infinty belongs to it
The interval has zero and all positive real numbers
1) The given number is
Since the number is negative, then it does not belong to the given interval
2) The given number is
Reciprocal it to change the sign of the power from negative to positive
Since the number is positive, then it belongs to the given interval
3) The given number is
Since the absolute neglect the sign of the number, then
Then the number is positive, so it belongs to the given interval