Answer:
Refer the above attachment for answer
She can not fit more than twenty rows in the class so anything equal to twenty or less (not including zero or negative numbers) would be fine. We don't have a limit for how many chairs in a row so I'm answering assuming that is not a problem so 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2, or 1 row(s) would be possible
Applying a dilation centered at the origin with scale factor has the effect of multiplying both coordinates of a point by :
So, in your case, the coordinates of the points double:
I believe it’s 80^, sorry if i’m wrong :)