It’s B or D probably B that’s just a guess though
Exterior angles of polygons always add up to 360 degrees.
A pentagon has 5 sides, so divide 360 degrees by 5 sides.
360/5 = 72
One exterior angle of a regular pentagon (all 5 sides and angles are equal) is 72 degrees.
Y-1/y+9 or it could be re write like y-1 or y+9
