sqrt(5) + sqrt(45) = sqrt(5) + sqrt(9*5) = sqrt(5) + sqrt(9)*sqrt(5)
= sqrt(5) + 3*sqrt(5) = 4*sqrt(5)
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It is 2*sqrt(5).
No, nor is it a real number. The square root of minus 54 is equal to the square root of plus 45, times i.
You can always add radicals, but you can't simplify unless the radicands have a common factor. For example, the square root of 20 plus the square root of 45 equals 2 times the square root of 5 plus 3 times the square root of 5, which is 5 times the square root of 5.
3 times the square root of 5
About 6.71 meters.