Answer
All numbers, except $\sqrt{-4}$.
Work Step by Step
All of the numbers are real, except $\sqrt{-4}$. This number is not real because square roots are only defined for positive numbers (i.e. $\sqrt{x}, x\geq0$).
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter R - Test - Chapter R Test - Page 39: 5
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