It is an irrational number that can't be determined or expressed as a fraction.
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You can. Just add the numbers together, and find their square root. One plus three is four; the square root of the sum is two.
No. The right hand side is always greater - unless both components are zero.
When you have calculated the square root of each number, simply add the results together and you will have the answer.
It is irrational.
Assuming the roots are positive, then ~ 15.59.