Answer:
A. Playfair's axiom.
Step-by-step explanation:
In a plane, given a line and a point not on it, at most, one line parallel to the given line can be drawn through the point.
- this implies Euclid's fifth postulate.
I believe it would be (4,5)
5 x 10 is 50 then 50 + 11 is 61 so I think it would be 61 ;)
