Afunction whose domain is (2,infinity)

YesDoes this mapping represent a function?YesDoes this mapping represent a function?NoDoes this mapping represent a function?NoDoes this table represent a function?NoDoes this table represent a function?YesDoes this table represent a function?NoDoes this graph represent a function?YesDoes this graph represent a function?NoDoes this graph represent a function?YesDoes this graph represent a function?YesDoes this graph represent a function?YesDoes this graph represent a function?NoDoes this graph represent a function?NoDoes this graph represent a function?YesDoes this graph represent a function?NoDoes this graph represent a function?NoDoes this graph represent a function?YesDoes this graph represent a function?YesDoes this set of ordered pairs represent a function?
(4 , -7) (-4 , 0) ( 0.9 , 19) ( 2 , 7 )NoDoes this set of ordered pairs represent a function?
(4 , -7) ( 4 , 0) ( 0.9 , 19) ( 2 , 7 )No

Idon’t understand this but 90