It is 15, -15.
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No. The square roots 8 are irrational, as are the square roots of most even numbers.
The real fourth roots are -0.3 and 0.3
Well, darling, the real square roots of 0.0049 are +0.07 and -0.07. It's simple math, really. Just remember, a negative times a negative gives you a positive, and a positive times a positive also gives you a positive. Math can be sassy too, you know!
They are 0.5 : it is a triple root.
Yes. Because they have to be a rational number