The answer is A. The answer is A because the teacher put names in a hat without looking. That narrows down the answer to A and B. Since he didn't do it in a special scientific way the answer is A
50-x^2=0 Move the x^2 to the other side x^2=50 Now take the square root of both sides x=+_(50)^1/2 (^1/2 means square root)(+_ is plus or minus. Sorry XD) Now simplify the square root X=+_5(2)^1/2 Voila. The answer is C
