Answers

2014-09-27T17:31:00+08:00
This is a try...please still wait for other answers and then choose what is best for you.

1. D: {xIx is set of real numbers}
2. D: {xIx is set of real numbers}
3. D: {xIx is set of non-negative real numbers} or {xIx≥0}
4. D: {xIx is set of non-negative real numbers} or {xIx≥0}
5. D: {xIx is set of real numbers}
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