The correct answer is D: √-7. √-7 is an imaginary number (it equals i√7 where i is the imaginary unit), so it is not a real number. All other options are real numbers.
A.√7
B.-√7
C.1/√7
D.√-7✓ Correct
Explanation
√-7 is an imaginary number (it equals i√7 where i is the imaginary unit), so it is not a real number. All other options are real numbers.
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