Please Help! If you can’t give a explanation don’t answer-

A:60

Explanation:

This should be a right triangle pythagorean theorm question. The therom is this . In which a and b are the two non slanted slides of the right triangle or the legs and c is the slanted side which will be the hypotenuse. To solve this question, you would have to do the the pythaorean theorm reversed. To do that, you would first have to square 61 to which you would get 3721. And then you would square 11 to which you would get 121. Then you would subtract 121 from 3721 and get 3600. Then you would square root 3600 and get 60.  

it would take 95 years for that supernova to be visible on earth, so the year would be about 2113. i hope i did my calculation right.