Im pretty sure it would be $60. If im wrong im sorryyyyy
Any number that is less than 2 will work. It is impossible to find the square root of a negative number (you can only get imaginary number) since anything square is a positive number.
PS. If you are confused by the answer, just ask me.
D (2 and 4), vertical angles oppose eachother, and are always congruent (identical).
Is their an image to go along with this question ?