book Maths Puzzle Numerical Ability

Classify the given number as real and rational, real and irrational, or complex.

(80) ^ 1/5

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Hi.
I have a question about solving linear equations. How would you solve X+Y=4? If you can help me solve just that one, then Ill know how to do the rest.
Thanks Alot
Sara Find all 2 x 2 matrices whose nullspace is the line 3x-5y=0