Question

Will give brainliest to correct answer.

Answer 1

Use Pythagorean's Theorem to find the length of x.  $30^2-16^2=x^2$  so  $900-256=x^2$  and  $x= \sqrt{644}$.  We can simplify that radicand down into a perfect square times a prime number, and that is $\sqrt{4*161}$.  4 is a perfect square that can be pulled out as a 2, so the length of x is $2 \sqrt{161}$, the choice on the top right. 

Answer 2

The correct answer is the top right