Answer: It's Already simplified!
{x | x < 0} and {x | x > 0} NO SOLUTION <em>(look at the picture)</em>
<em>There is no number that is both positive and negative.</em>
{x | x ≤ 0} and {x | x ≥ 0} SOLUTION: the number 0
{x | x ≤ 0} or {x | x ≥ 0} SOLUTION: all real numbers
<h2>Square root of 61</h2>
The line looks like it is around 6, the square root of 61 is 7.810249675906654, so that would be the closest to our estimate.